About America

The United States of America is a federal constitutional republic comprising fifty states and a federal district. The country is situated almost entirely in the western hemisphere: its forty-eight contiguous states and Washington, D.C., the capital district, lie in central North America between the Pacific and Atlantic Oceans, bordered by Canada to the north and Mexico to the south; the state of Alaska is in the northwest of the continent with Canada to its east, and the state of Hawaii is in the mid-Pacific. The United States also possesses fourteen territories, or insular areas, that are scattered around the Caribbean and Pacific.

At 3.79 million square miles (9.83 million km²) and with over 300 million people, the United States is the third or fourth largest country by total area, and third largest by land area and by population. The United States is one of the world's most ethnically diverse nations, the product of large-scale immigration from many countries. Its national economy is the largest in the world, with a nominal 2006 gross domestic product (GDP) of more than US$13 trillion.

The nation was founded by the thirteen colonies of Great Britain located along the Atlantic seaboard. After proclaiming themselves as "states," they issued the Declaration of Independence on July 4, 1776. The rebellious states defeated Britain in the American Revolutionary War, the first successful colonial war of independence.

A federal convention adopted the current United States Constitution on September 17, 1787; its ratification the following year made the states part of a single republic. The Bill of Rights, comprising ten constitutional amendments, was ratified in 1791. In the nineteenth century, the United States acquired land from France, Spain, Mexico, and Russia, and annexed the Republic of Texas and the Republic of Hawaii. The American Civil War ended slavery in the United States and prevented a permanent split of the country. The Spanish-American War and World War I confirmed its status as a military power. In 1945, the United States emerged from World War II as the first country with nuclear weapons and a permanent member of the United Nations Security Council. The sole remaining superpower in the post–Cold War era, the United States is perceived by many as the dominant economic, political, cultural, and military force in the world

About Arizona

     The State of Arizona (IPA: /ˌærɪˈzoʊnə/) is a state located in the southwestern region of the United States of America. The capital and largest city is Phoenix. The three next largest cities are Tucson, Mesa and Glendale. Arizona was the 48th and last of the contiguous states admitted to the Union on February 14, 1912. Arizona is noted for its desert climate, exceptionally hot summers and mild winters, but the high country in the north features pine forests and mountain ranges which contrast with the lower deserts.

     Arizona is one of the Four Corners states. It borders New Mexico, Utah, Nevada, California, touches Colorado, and has a 389 mi (626 km) international border with the states of Sonora and Baja California in Mexico. Aside from the Grand Canyon, many other National Forests, Parks, Monuments, and Indian reservations are located in the state.

     Arizona is located in the Western United States as one of the Four Corners states. Arizona is the sixth largest state in area, after New Mexico and before Nevada. Of the state's 118,000 square miles (306,000 km²), approximately 15% is privately owned. The remaining area is government forest and park land, recreation areas and Native American reservations.

     Arizona is best known for its desert landscape, which is rich in xerophyte plants such as cactus. It is also known for its climate, which presents exceptionally hot summers and mild winters. Less well known is the pine-covered high country of the Colorado Plateau in the north-central portion of the state, which contrasts with the desertic Basin and Range region in the southern portions of the state.

     Like other states of the Southwest, Arizona has an abundance of topographical characteristics in addition to its desert climate. More than half of the state features mountains and plateaus and contains the largest stand of Ponderosa pine in the United States. The Mogollon Rim, a 2000-foot (600 m) escarpment, cuts across the central section of the state and marks the southwestern edge of the Colorado Plateau, where the state experienced its worst forest fire ever in 2002. Arizona belongs firmly within the Basin and Range region of North America. The region was shaped by prehistoric volcanism, followed by a cooling-off and related subsidence. The entire region is slowly sinking.

     The Grand Canyon is a colorful, steep-sided gorge, carved by the Colorado River, in northern Arizona. 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, visiting on numerous occasions 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 kilometers) and attains a depth of more than 1 mile (1.6 km). Nearly 2 billion years of the Earth's history has been exposed as the Colorado River and its tributaries cut through layer after layer of sediment as the Colorado Plateaus have uplifted.