Arizona (/ˌærɪˈzoʊnə/ (About this soundlisten) ARR-iz-OH-nə; Navajo: Hoozdo Hahoodzo; O'odham: Alĭ ṣonak) is a state in the southwestern region of the United States. It is also part of the Western and the Mountain states. It is the 6th largest and the 14th most populous of the 50 states. Its capital and largest city is Phoenix. Arizona shares the Four Corners region with Utah, Colorado, and New Mexico; its other neighboring states are Nevada and California to the west and the Mexican states of Sonora and Baja California to the south and southwest.
Arizona is the 48th state and last of the contiguous states to be admitted to the Union, achieving statehood on February 14, 1912. Historically part of the territory of Alta California in New Spain, it became part of independent Mexico in 1821. After being defeated in the Mexican–American War, Mexico ceded much of this territory to the United States in 1848. The southernmost portion of the state was acquired in 1853 through the Gadsden Purchase.
Southern Arizona is known for its desert climate, with very hot summers and mild winters. Northern Arizona features forests of pine, Douglas fir, and spruce trees; the Colorado Plateau; mountain ranges (such as the San Francisco Mountains); as well as large, deep canyons, with much more moderate summer temperatures and significant winter snowfalls. There are ski resorts in the areas of Flagstaff, Alpine, and Tucson. In addition to the internationally known Grand Canyon National Park, which is one of the world's seven natural wonders, there are several national forests, national parks, and national monuments.
About one-quarter of the state is made up of Indian reservations that serve as the home of 27 federally recognized Native American tribes, including the Navajo Nation, the largest in the state and the United States, with more than 300,000 citizens. Although federal law gave all Native Americans U.S. citizenship (and thereby the right to vote) in 1924, Arizona excluded those living on reservations in the state from voting until the state Supreme Court ruled in favor of Native American plaintiffs in Trujillo v. Garley (1948).
Arizona is in the Southwestern United States as one of the Four Corners states. Arizona is the sixth largest state by area, ranked after New Mexico and before Nevada. Of the state's 113,998 square miles (295,000 km2), approximately 15% is privately owned. The remaining area is public forest and park land, state trust land and Native American reservations.
Arizona is well known for its desert Basin and Range region in the state's southern portions, which is rich in a landscape of xerophyte plants such as the cactus. This region's topography was shaped by prehistoric volcanism, followed by the cooling-off and related subsidence. Its climate has exceptionally hot summers and mild winters. The state is less well known for its pine-covered north-central portion of the high country of the Colorado Plateau (see Arizona Mountains forests).
Like other states of the Southwest United States, Arizona has an abundance of mountains and plateaus. Despite the state's aridity, 27% of Arizona is forest, a percentage comparable to modern-day Romania or Greece. The world's largest stand of ponderosa pine trees is in Arizona.
The Mogollon Rim, a 1,998-foot (609 m) escarpment, cuts across the state's central section and marks the southwestern edge of the Colorado Plateau. In 2002, this was an area of the Rodeo–Chediski Fire, the worst fire in state history until 2011.
Located in northern Arizona, the Grand Canyon is a colorful, deep, steep-sided gorge, carved by the Colorado River. The canyon is one of the Seven Natural Wonders of the World and is largely contained in the Grand Canyon National Park—one of the first national parks in the United States. President Theodore Roosevelt was a major proponent of designating the Grand Canyon area as a National Park, often visiting to hunt mountain lion and enjoy the scenery. The canyon was created by the Colorado River cutting a channel over millions of years, and is about 277 miles (446 km) long, ranges in width from 4 to 18 miles (6 to 29 km) and attains a depth of more than 1 mile (1.6 km). Nearly two billion years of the Earth's history have been exposed as the Colorado River and its tributaries cut through layer after layer of sediment as the Colorado Plateau uplifted.
Arizona is home to one of the most well-preserved meteorite impact sites in the world. Created around 50,000 years ago, the Barringer Meteorite Crater (better known simply as "Meteor Crater") is a gigantic hole in the middle of the high plains of the Colorado Plateau, about 25 miles (40 km) west of Winslow. A rim of smashed and jumbled boulders, some of them the size of small houses, rises 150 feet (46 m) above the level of the surrounding plain. The crater itself is nearly a mile (1.6 kilometers) wide and 570 feet (170 m) deep.
Arizona is one of two U.S. states (Hawaii being the other) that do not observe Daylight Saving Time. (The large Navajo Nation in the state's northeastern region does.)