Southwestern United States

Regional geography

The geography of the region is mainly made up of four features: the Mojave, Sonoran, and Chihuahuan Deserts, and the Colorado Plateau; although there are other geographical features as well, such as a portion of the Great Basin Desert. The deserts dominate the southern and western reaches of the area, while the plateau (which is largely made up of high desert) is the main feature north of the Mogollon Rim. The two major rivers of the region are the Colorado River, running in the northern and western areas, and the Rio Grande, running in the east, north to south.

Formed approximately 8000 years ago, the Chihuahuan Desert is a relatively dry desert, although it is slightly wetter than the Sonoran Desert to the west. The Chihuahuan Desert spreads across the southeastern portion of the region, covering from southeastern Arizona, across southern and central New Mexico, and the portion of western Texas included in the Southwest. While it is the second largest desert in the United States, only a third of the desert is within the United States, with the rest in Mexico. El Paso and Albuquerque are the major US cities in this desert, with other smaller cities being Las Cruces and Roswell in New Mexico and Willcox in Arizona.

The elevation in the Chihuahuan Desert varies from about 1,750 to 6,000 feet (500 to 1,800 meters), as well as several larger mountain ranges within or bordering this desert including the Black Range, Organ Mountains, Capitan Mountains, Manzano Mountains, Sacramento Mountains, Sandia Mountains, Magdalena Mountains, and Chiracahua Mountains, plus many smaller mountain ranges contained in the area, namely the Animas, San Andres, Guadalupe Mountains, and Doña Ana Mountains in New Mexico; and the Franklin, Hueco, and Davis Mountains in Texas. It also reaches up into the foothills of the higher ranges such as the Black Range and Oscura Mountains in New Mexico. High above the desert, these forest-covered and sometimes snow-capped mountains form sky islands, with radically different flora and fauna than the surrounding desert below. The sky islands also supply the surrounding desert foothills with flowing water during the spring runoff and after the summer storms of the New Mexican monsoon season. The Chihuahuan is a "rain shadow" desert, formed between two mountain ranges (the Sierra Madre Occidental on the west and the Sierra Madre Oriental on the east) which block oceanic precipitation from reaching the area. The Chihuahuan Desert is considered the "most biologically diverse desert in the Western Hemisphere and one of the most diverse in the world," and includes more species of cacti than any other desert in the world. The most prolific plants in this region are agave, yucca and creosote bushes, in addition to the ubiquitous presence of various cacti species.

History

Pre-European contact

Human history in the Southwest begins between 19,000 and 21,000 years BCE (21,000 to 23,000 years before present), with a group of likely hunter-gatherers whose presence is recorded in the White Sands footprints. No material culture from this group is known. Material culture remains in the Southwest appear with the arrival of the Clovis culture, a Paleo-Indian hunter-gatherer culture which arrived sometime around 9000 BCE. Clovis culture gave way to the Folsom tradition in New Mexico. The Clovis and Folsom technological cultures eventually were replaced by a diversification of cultural traditions leading to the rise of the three primary Pre-Columbian Indian cultures of the Southwest: the Ancestral Pueblo people, the Hohokam, and the Mogollon, all of which existed among other surrounding cultures including the Patayan and Sinagua. Maize was first cultivated in the region sometime during the early first millennium BC, but it took several hundred years for the native cultures to become dependent on it as a food source. As their dependence on maize grew, Pre-Columbian Indians began developing irrigation systems around 600 CE.

Archaeological evidence suggests the Ancestral Pueblo people, sometimes referred to as the Anasazi, began settling the area in approximately 1500 BC. However, the term "Anasazi" is viewed by modern Pueblo people as derogatory and is increasingly disused. Eventually, the Ancestral Pueblo would spread throughout the entire northern section of the Southwest. This culture would go through several different eras lasting from approximately 1500 BC through the middle of the 15th century AD: the Basketmaker I, II, and III phases followed by the Pueblo I, II, III, and IV. As the Puebloans transitioned from a nomadic lifestyle to one based on both dry land and irrigated agriculture, their first domiciles were pithouses. The Mogollon culture developed later than the Puebloan, arising in the east at around 300 BC. Their range would eventually extend deep into what would become Mexico, and dominate the southeastern portion of the Southwest. Their settlements would evolve over time from pit-dwellings through pueblos and ultimately incorporate cliff-dwellings. The Hohokam were the last of these ancestral cultures to develop into a distinct cultural tradition, somewhere around AD 1, but became the most populous of the three by AD 1300, despite occupying the smallest territory of the three, covering most of the southwest portion. Beginning in approximately AD 600, the Hohokam began to develop an extensive series of irrigation canals; of the three major cultures in the Southwest, only the Ancestral Puebloans of the Chaco culture and the Hohokam developed irrigation as a means of watering their agriculture. The Hohokam were known for large settlements with ballcourts (likely associated with the Mesoamerican ballgame) and monumental architecture known as platform mounds.

Arrival of Europeans

The first European intrusion into the region came from the south. In 1539, a Jesuit Franciscan named Marcos de Niza led an expedition from Mexico City which passed through eastern Arizona. The following year Francisco Vázquez de Coronado, based on reports from survivors of the Narváez expedition (1528–36) who had crossed eastern Texas on their way to Mexico City, led an expedition to discover the Seven Golden Cities of Cíbola. The 1582–3 expedition of Antonio de Espejo explored New Mexico and eastern Arizona; and this led to Juan de Oñate's establishment of the Spanish province of Santa Fe de Nuevo México in 1598, with a capital founded near Ohkay Oweenge Pueblo, which he called San Juan de los Caballeros. Oñate's party also attempted to establish a settlement in Arizona in 1599, but were turned back by inclement weather. In 1610, Santa Fe was founded, making it the oldest capital in United States.

In 1664 Juan Archuleta led an expedition into what is now Colorado, becoming the first European to enter. A second Spanish expedition was led into Colorado by Juan Ulibarrí in 1706, during which he claimed the Colorado territory for Spain.

From 1687 to 1691 the Jesuit priest Eusebio Kino established several missions in the Santa Cruz River valley; and Kino further explored southern and central Arizona in 1694, during which he discovered the ruins of Casa Grande. Beginning in 1732, Spanish settlers began to enter the region, and the Spanish started bestowing land grants in Mexico and the Southwest US. In 1751, the O'odham rebelled against the Spanish incursions, but the revolt was unsuccessful. In fact, it had the exact opposite effect, for the result of the rebellion was the establishment of the presidio at Tubac, the first permanent European settlement in Arizona.

In 1768, the Spanish created the Provincia de las Californias, which included California and the Southwest US. Over approximately the next 50 years, the Spanish continued to explore the Southwest, and in 1776 the City of Tucson was founded when the Presidio San Augustin del Tucson was created, relocating the presidio from Tubac.

In 1776, two Franciscan priests, Francisco Atanasio Domínguez and Silvestre Vélez de Escalante, led an expedition from Santa Fe heading to California. After passing through Colorado, they became the first Europeans to travel into what is now Utah. Their journey was halted by bad weather in October, and they turned back, heading south into Arizona before turning east back to Santa Fe.

Becoming states

Of the states of which at least a portion make up the Southwest, Texas was the first to achieve statehood. On December 29, 1845, the Republic of Texas was annexed, bypassing the status of becoming a territory, and immediately became a state. Initially, its borders included parts of what would become several other states: almost half of New Mexico, a third of Colorado, and small portions of Kansas, Oklahoma, and Wyoming. Texas current borders were set in the Compromise of 1850, where Texas ceded land to the federal government in exchange for $10 million, which would go to paying off the debt Texas had accumulated in its war with Mexico.

Following the Mexican Cession, the lands of what had been the Mexican territory of Alta California were in flux: portions of what is now New Mexico were claimed, but never controlled, by Texas. With the Compromise of 1850, the states of Texas and California were created (Texas as a slave state, and California as a free state), as well as the Utah Territory and New Mexico Territory. The New Mexico Territory consisted of most of Arizona and New Mexico (excluding a strip along their southern borders), a small section of southern Colorado, and the very southern tip of Nevada; while the Utah Territory consisted of Utah, most of Nevada, and portions of Wyoming and Colorado. The New Mexico Territory was expanded along its southern extent, to its current border, with the signing of the Gadsden Purchase Treaty on December 30, 1853, which was ratified by the U.S. Congress, with some slight alterations, in April 1854.

The Colorado Territory was organized on February 28, 1861, created out of lands then currently in the Utah, Kansas, Nebraska, and New Mexico territories. The Nevada Territory was also organized in 1861, on March 2, with land taken from the existing Utah Territory. Initially, only the western 2/3 of what is currently the State of Nevada was included in the territory, with its boundary to the east being the 39th meridian west from Washington, and to the south the 37th parallel. In 1862 Nevada's eastern border shifted to the 38th meridian west from Washington, and finally to its current position at the 37th meridian west from Washington in 1866. The boundary modification in 1866 also included adding the southern triangular tip of the present-day state, taken from the Arizona Territory.

From July 24–27, 1861 a Confederate force under the command of Lt. Colonel John Robert Baylor forced the surrender of the small Union garrison stationed at Fort Fillmore, near Mesilla, New Mexico. On August 1, 1861, Baylor declared the creation of the Arizona Territory, and claimed it for the Confederacy, with Mesilla as its capital. The territory, which had been formed by the portion of the existing New Mexico Territory below the 34th parallel, became official on February 14, 1862.

Since statehood

The 1930s saw the beginning of the ski industry in the Southwest. Resorts were established in Colorado in areas such as Estes Park, Gunnison, and on Loveland Pass. New Mexico's oldest ski area is Sandia Peak Ski Area at the eastern edge of Albuquerque, which opened to skiers in 1936. At the end of the decade, in 1939, with the establishment of Alta Ski Area, Utah's skiing began to be developed.

Due to the ski conditions in the state, during WWII, the 10th Mountain Division established Camp Hale in Colorado to train elite ski troops.

Origins of the term and historical/cultural variations

While this article deals with the core definition for the American Southwest, there are many others. The various definitions can be broken down into four main categories: Historical/Archeological; Geological/Topographical; Ecological; and Cultural. In the 1930s and 1940s, many definitions of the Southwest included all or part of Texas, Oklahoma, New Mexico, Arizona, California, Colorado, and Utah. As time has gone on, the definition of the Southwest has become more solidified and more compact. For example, in 1948 the National Geographic Society defined the American Southwest as all of California, Nevada, Utah, Arizona, Colorado, and New Mexico, and the southernmost sections of Oregon, Idaho, and Wyoming, as well as parts of southwest Nebraska, western Kansas, Oklahoma, and Texas. By 1977, the Society's definition had narrowed to only the four states of Utah, Arizona, Colorado, and New Mexico; and by 1982 the portion of the Southwest in the United States, as defined by the Society, had shrunk to Arizona and New Mexico, with the southernmost strip of Utah and Colorado, as well as the Mojave and Colorado deserts in California. Other individuals who focus on Southwest studies who favored a more limited extent of the area to center on Arizona and New Mexico, with small parts of surrounding areas, include Erna Fergusson, Charles Lummis (who claimed to have coined the term, the Southwest), and cultural geographer Raymond Gastil, and ethnologist Miguel León-Portilla.

Geographer D. W. Meinig defines the Southwest in a very similar fashion to Reed: the portion of New Mexico west of the Llano Estacado and the portion of Arizona east of the Mojave-Sonoran Desert and south of the "canyon lands" and also including the El Paso district of western Texas and the southernmost part of Colorado. Meinig breaks the Southwest down into four distinct subregions. He calls the first subregion "Northern New Mexico," and describes it as focused on Albuquerque and Santa Fe. It extends from the San Luis Valley of southern Colorado to south of Socorro and including the Sandia-Manzano Mountains, with an east–west breadth in the north stretching from the upper Canadian River to the upper San Juan River. The area around Albuquerque is sometimes called Central New Mexico.

"Central Arizona" is a vast metropolitan area spread across one contiguous sprawling oasis, essentially equivalent to the Phoenix metropolitan area. The city of Phoenix is the largest urban center, and located in the approximate center of the area that includes Tempe, Mesa, and many others.

Historical/archeological

As the US expanded westward, the country's western border also shifted westward, and consequently, so did the location of the Southwestern and Northwestern United States. In the early years of the United States, newly colonized lands lying immediately west of the Appalachian Mountains were detached from North Carolina and given the name Southwest Territory. During the decades that followed, the region known as "the Southwestern United States" covered much of the Deep South east of the Mississippi River.

As territories and eventual states to the west were added after the Mexican–American War, the geographical "Southwest" expanded, and the relationship of these new acquisitions to the South itself became "increasingly unclear."

However, archeologist Erik Reed gives a description which is the most widely accepted as defining the American Southwest, which runs from Durango, Colorado in the north, to Durango, Mexico, in the south, and from Las Vegas, Nevada in the west to Las Vegas, New Mexico in the East. Reed's definition is roughly equivalent to the western half of the Learning Center of the American Southwest's definition, leaving out any portion of Kansas and Oklahoma, and much of Texas, as well as the eastern half of New Mexico. Since this article is about the Southwestern United States, the areas of Sonora and Chihuahua in Mexico will be excluded. The portion left includes Arizona and western New Mexico, the very southernmost part of Utah, southwestern Colorado, the very tip of west Texas, and triangle formed by the southern tip of Nevada. This will be the defined scope that is used in this article unless otherwise specified in a particular area.

Geological/topographical

Parts of the other states make up the various areas that can be included in the Southwest, depending on the source. The Learning Center of the American Southwest (LCAS) does not rely on current state boundaries, and defines the American Southwest as parts of Arizona, Colorado, Kansas, New Mexico, Oklahoma, Texas, and Utah.

From this perspective, almost all of the region's physiographical traits, geological formations, and weather are contained within a box between 26° and 38° northern latitude, and 98° 30' and 124° western longitude.

Ecological

When looking at the fauna of the region, there is a broader definition of the American Southwest. The Southwestern Center for Herpetological Research defines the Southwest as being only the states of Arizona, New Mexico, with parts of California, Nevada, Texas, and Utah; although they include all of those six states in their map of the region, solely for ease of defining the border.

Cultural

Lawrence Clark Powell, a major bibliographer whose emphasis is on the Southwest, defined the American Southwest in a 1958 Arizona Highways article as, "the lands lying west of the Pecos, north of the [Mexican] Border, south of the Mesa Verde and the Grand Canyon, and east of the mountains which wall off Southern California and make it a land in itself."

Texas has long been the focal point of this dichotomy, and is often considered, as such, the core area of "the South's Southwest." While the Trans-Pecos area is generally acknowledged as part of the desert Southwest, most of Texas and large parts of Oklahoma are often placed into a sub-region of the South, which some consider southwestern in the general framework of the original application, meaning the "Western South." This is an area containing the basic elements of Southern history, culture, politics, religion, and linguistic and settlement patterns, yet blended with traits of the frontier West. While this particular Southwest is notably different in many ways from the classic "Old South" or Southeast, these features are strong enough to give it a separate southwestern identity quite different in nature from that of the interior southwestern states to the west.

One of these distinguishing characteristics in Texas—in addition to having been a Confederate state during the Civil War—is that Indigenous and Spanish American culture never played a central role in the development of this area in relative comparison to the others, as the vast majority of settlers were Anglo and blacks from the South. Although the present-day state of Oklahoma was Indian Territory until the early 20th century, many of these American Indians were from the southeastern United States and became culturally assimilated early on. The majority of members of these tribes also allied themselves with the Confederacy during the Civil War. Combined with that, once the territory was open for settlement, southeastern pioneers made up a disproportionate number of these newcomers. All this contributed to the new state having a character that differed from other parts of the Southwest with large American Indian populations.

The fact that a majority of residents of Texas and Oklahoma—unlike those in other "southwestern" states—self-identify as living in the South and consider themselves southerners rather than the West and westerners—also lends to treating these two states as a somewhat distinct and separate entity in terms of regional classification.

Vegetation and terrain

Vegetation of the southwest includes various types of yucca, along with saguaro cactus, barrel cactus, prickly pear cactus, desert spoon, creosote bush, sagebrush, and greasewood. Many native cacti grow throughout Nevada, Utah, Colorado, and west Texas. Steppe is also located all over the high plains areas in Colorado, New Mexico, and Texas. The mountains of the southwestern states have large tracts of alpine trees. There are also many pinyons and juniper species native to the southwest.

Landscape features of the core southwestern areas include mountains, canyons, mesas, buttes, high broad basins, plateaus, desert lands, and some plains, characteristic of the Basin and Range Province. The entire southwestern region features semi-arid to arid terrain. The far eastern part of southwestern Texas, for example, the Texas Hill Country, consists of dry, tall, and rugged rocky hills of limestone and granite. South Texas and the Rio Grande Valley is mostly flat with many places consisting of scrub and bare topsoil, much like the deserts further west.

Wildlife

The region has an extremely diverse bird population, with hundreds of species being found in the American Southwest. In the Chiricahua Mountains alone, in southeastern Arizona, there can be found more than 400 species. Species include Canada (Branta canadensis) and snow geese, sandhill cranes (Grus canadensis), and the roadrunner, the state bird of New Mexico and most famous bird in the region, is found in all states of the Southwest. Birds of prey include the red-tailed hawk (Buteo jamaicensis), Cooper's hawk (Accipiter cooperii), the osprey (Pandion haliaetus), golden eagles (Aquila chrysaetos), Harris's hawk (Parabuteo unicinctus), American kestrel (Falco sparverius), peregrine falcon (Falco peregrinus), the gray hawk (Buteo plagiatus), the American barn owl (Tyto furcata), the western screech owl (Megascops kennicottii), the great horned owl (Bubo virginianus), the elf owl (Micrathene whitneyi), and the burrowing owl (Athene cunicularia)

Other bird species include the turkey vulture (Cathartes aura), the black vulture (Coragyps atratus), the northern cardinal (Cardinalis cardinalis), the blue grosbeak (Passerina caerulea), the house finch (Haemorhous mexicanus), the lesser goldfinch (Spinus psaltria), the broad-billed hummingbird (Cynanthus latirostris), the black-chinned hummingbird (Archilochus alexandri), Costa's hummingbird (Calypte costae), Gambel's quail (Callipepla gambelii), the common raven (Corvus corax), the Gila woodpecker (Melanerpes uropygialis), the gilded flicker (Colaptes chrysoides), the cactus wren (Campylorhynchus brunneicapillus), the rock wren (Salpinctes obsoletus), and the federally endangered Southwest willow flycatcher (Empidonax traillii extimus). Four types of doves call the Southwest home: the white-winged dove (Zenaida asiatica), the mourning dove (Zenaida macroura), the common ground dove (Columbina passerina), and the Inca dove (Columbina inca).

Mammal species include the bison, bobcat, coyote, black bear, black-tailed jackrabbit, desert cottontail, desert bighorn sheep, mule deer, white-tailed deer, gray fox, mountain lion, river otter, long-tailed weasel, western spotted skunk, pronghorn, raccoon, cactus mouse, and Ord's kangaroo rat, all of which can be found in parts of every southwestern state. Elk are found in parts of Colorado, New Mexico, Utah, and Arizona. White-nosed coati and collared peccary—or javelina—in the Southwest are normally found in southern areas of Arizona, New Mexico, and Texas near the Mexican border. Jaguars can be found in the bootheel region of Southwestern New Mexico. The Mexican wolf (Canis lupus baileyi) was reintroduced to Arizona and New Mexico in 1998. A U.S. Fish and Wildlife Service study reported a minimum population of 241 Mexican wolves in southwest New Mexico and southeast Arizona at the beginning of 2023.

Climate

The southwestern United States features a semi-arid to arid climate, depending on the location. Much of the Southwest is an arid desert climate, but higher elevations in the mountains in each state, with the exception of West Texas, feature alpine climates with very large amounts of snow. The metropolitan areas of Phoenix, Tucson, Las Vegas, and El Paso hardly ever receive any snow at all, as they are strictly desert lands with mountains. Albuquerque receives less snow than other cities, but still receives significant snowfalls occasionally in the winter. Although it snows in this region, the snow in this part of the United States melts rapidly, often before nightfall. This is due mainly to the higher altitude and abundant sunshine in these states.

Nevada and Arizona are both generally arid with desert lands and mountains, and receive large amounts of snow in the higher elevations in and near the mountains. New Mexico, Utah, and Colorado are generally arid, with desert lands and mountains as well. They all receive decent amounts of snow and large amounts of snow in the high elevations in the mountains, although some areas in far southwestern and southern New Mexico do not receive much snow at all at lower elevations. West Texas is generally arid as well but does not receive the same amount of snow that the other southwestern states receive at their high elevations. The terrain of western Texas in the Southwest is the flat, rolling land of the plains, which eventually turns into a desert with some hills. There are significant mountains as well in west Texas upon reaching the Trans-Pecos area.

The term "High Desert" is synonymous with this region. The High Desert is generally defined as the Mojave Desert and the Colorado Plateau, which extends from inland southern California into southern Nevada, east to the Rio Grande Rift in New Mexico. The High Desert also extends into parts of the Northwest, such as the Red Desert in southwestern Wyoming. The High Desert is very different from the lower desert lands found in Arizona, in the Sonoran Desert. This area of the desert land generally sits at a very high elevation, much higher than the normal desert land, and can receive very cold temperatures at night in the winter (with the exception of California, southern Nevada and southwestern Utah), sometimes near zero degrees on very cold nights. The High Desert also receives a decent amount of snowfall in the winter (with the exception of California, southern Nevada and southwestern Utah) which melts very quickly. Rain falls in this region mainly in the summer, during the North American Monsoon season.

National parks, monuments and forests

The southwestern United States contains many well-known national parks including Grand Canyon in Arizona, Death Valley in California, Great Sand Dunes in Colorado, Arches in Utah, Big Bend in Texas, Great Basin in Nevada, and White Sands in New Mexico.

Arizona parks and monuments include Grand Canyon, Monument Valley (a Navajo Nation park), Petrified Forest, and Saguaro national parks; the national monuments of Agua Fria, Canyon de Chelly, Casa Grande Ruins, Chiricahua, Ironwood Forest, Montezuma Castle, Navajo, Organ Pipe Cactus, Pipe Spring, Sonoran Desert, Sunset Crater, Tonto, Tuzigoot, Vermilion Cliffs, Walnut Canyon, and Wupatki. Other federal areas include the Apache–Sitgreaves National Forests and Tumacacori National Historical Park.

Southern California parks and monuments include Death Valley and Joshua Tree national parks; the national monuments of Castle Mountains, Mojave Trails, Sand to Snow, and San Gabriel Mountains; and Mojave National Preserve.

Colorado parks and monuments include Great Sand Dunes, Black Canyon of the Gunnison, and Mesa Verde national parks; the national monuments of Browns Canyon, Canyons of the Ancients, Colorado, Hovenweep, and Yucca House. Other federal areas include Curecanti National Recreation Area and Bent's Old Fort National Historic Site; as well as the national forests of San Isabel, San Juan, and Uncompahgre.

Nevada has one national park at Great Basin, and the national monuments of Basin and Range, Gold Butte, and Tule Springs Fossil Beds. Other federal areas include Humboldt-Toiyabe National Forest, Lake Mead National Recreation Area, and Red Rock Canyon National Conservation Area.

New Mexico has two national parks, at Carlsbad Caverns and White Sands. National monuments include Aztec Ruins, Bandelier, El Malpais, El Morro, Gila Cliff Dwellings, Kasha-Katuwe Tent Rocks, Organ Mountains–Desert Peaks, Petroglyph, Rio Grande del Norte, and Salinas Pueblo Missions. Other federal park areas include Chaco Culture National Historical Park, Pecos National Historical Park, Sevilleta National Wildlife Refuge, and the national forests of Apache, Carson, Gila, Lincoln, and Santa Fe.

Demographics

Hispanic Americans can be found in large numbers in every major city in the Southwest such as El Paso (80%), San Antonio (63%), Los Angeles (48%), Albuquerque (47%), Phoenix (43%), Tucson (41%), Las Vegas (32%), and Mesa (27%). Over 60 percent of the Latino population in the Southwest is Mexican American.

Very large Hispanic American populations can also be found in the smaller cities such as Eagle Pass (96%), Las Cruces (56%), Yuma (55%), Blythe (53%), Pueblo (48%), Santa Fe (48%), and Glendale (36%). Many small towns throughout the southwestern states also have significantly large Latino populations.

The largest Asian American populations in the southwest can be found in California and Texas, with some significant Asian population in Phoenix. The most significant American Indian populations can be found in New Mexico and Arizona.

More than 20% of Native Americans live in the Southwest.

Before 1700, the only permanent Spanish settlements in the Southwest were along the valley of the upper Rio Grande in New Mexico.

Cities and urban areas

The area also contains many of the nation's largest cities and metropolitan areas, despite relatively low population density in rural areas. Phoenix is the fifth most populous city in the country, and Albuquerque and Las Vegas were some of the fastest-growing cities in the United States. Also, the region as a whole has witnessed some of the highest population growth in the United States, and according to the US Census Bureau, in 2008–2009, Utah was the fastest-growing state in America. As of the 2010 Census, Nevada was the fastest-growing state in the United States, with an increase of 35.1% in the last ten years. Additionally, Arizona (24.6%), Utah (23.8%), Texas (20.6%), and Colorado (16.9%) were all in the top ten fastest-growing states as well.

The largest metropolitan areas are centered around Phoenix (with an estimated population of more than 5 million as of 2020), Las Vegas (more than 2.2 million), Tucson (more than 1 million), Albuquerque (more than 900,000), and El Paso (more than 840,000). Those five metropolitan areas have an estimated total population of more than 9.6 million as of 2017, with nearly 60 percent of them living in the two Arizona cities—Phoenix and Tucson.

Sports

Professional

Of the four major professional sports, Phoenix and Las Vegas are the only metropolitan areas in the Southwest that have representatives. Las Vegas is home to the Las Vegas Raiders NFL football team and the Vegas Golden Knights NHL hockey team. Phoenix is home to the Arizona Diamondbacks in Major League Baseball, Arizona Cardinals in the National Football League, and the Phoenix Suns in the National Basketball Association. The Greater Phoenix area is home to the Cactus League, one of two spring training leagues for Major League Baseball; fifteen of MLB's thirty teams are now included in the Cactus League. The region has also been the scene of several NFL super bowls. Sun Devil Stadium in Tempe held Super Bowl XXX in 1996, when the Dallas Cowboys defeated the Pittsburgh Steelers. State Farm Stadium in Glendale, Arizona hosted Super Bowl XLII on February 3, 2008, in which the New York Giants defeated the New England Patriots, as well as Super Bowl XLIX, which resulted in the New England Patriots defeating the Seattle Seahawks 28–24. The U.S. Airways Center hosted both the 1995 and the 2009 NBA All-Star Games.

In 1997, the Phoenix Mercury were one of the original eight teams to launch the Women's National Basketball Association (WNBA). Indoor American football is represented by the Arizona Rattlers located in Phoenix. The region is also host to several major professional golf events: the LPGA's Founder's Cup; the Phoenix Open and the Shriners Hospitals for Children Open (in Las Vegas) of the PGA; and the Tucson Conquistadores Classic (in Tucson), and the Charles Schwab Cup Championship (in Scottsdale) on the Champions Tour of the PGA.

NASCAR has two venues within the region: The Phoenix International Raceway, was built in 1964 with a one-mile oval, with a one-of-a-kind design, as well as a 2.5-mile road course, and the Las Vegas Motor Speedway, a 1,200-acre (490 ha) complex of multiple tracks for motorsports racing. There are several nationally recognized running events in the region, including The Phoenix Marathon, a qualifier for the Boston Marathon, and the Rock 'n' Roll Marathon Series in both Phoenix and Las Vegas. Las Vegas is also the end point for the annual Baker to Vegas Challenge Cup Relay, a 120-mile-long foot race by law enforcement teams from around the world, which is the largest law enforcement athletic event in the world.

The Professional Bull Riders association has its headquarters in Pueblo, Colorado. The PBR World Finals are held annually in Las Vegas, which also hosts the National Finals Rodeo.

College

The Southwest is home to a rich tradition of college sports. The Big-12 Conference has two teams in the region, the Arizona State Sun Devils and the University of Arizona Wildcats. The Mountain West Conference also has two teams, the UNLV Rebels and the University of New Mexico Lobos. Conference USA is represented by the University of Texas at El Paso Miners. The Big Sky Conference has two teams: the Lumberjacks of Northern Arizona University in Flagstaff, Arizona, and the Southern Utah University Thunderbirds in Cedar City, Utah. The Western Athletic Conference also has two representatives, the New Mexico State University Aggies in Las Cruces, New Mexico, and the Grand Canyon University Antelopes in Phoenix.

Las Vegas is becoming the nexus for NCAA league basketball tournaments. The Mountain West Conference, the Western Athletic Conference, the West Coast Conference, and the Pac-12 Conference all hold their conference basketball tournaments in Las Vegas.

The Southwest is the site of six college football bowl games: the Rate Bowl, formerly known as the Cheez-it Bowl, in Phoenix; the Arizona Bowl in Tucson; the Fiesta Bowl, played at the University of Phoenix Stadium; the Las Vegas Bowl; the New Mexico Bowl in Albuquerque; and the Sun Bowl in El Paso, Texas.

The erstwhile [20th century] Southwest Conference might seem to have been named after this region, but it had no teams from Arizona nor New Mexico. All but one of its teams were from schools in Texas.