United States

The [[Cliff Palace The United States of America (USA), commonly known as the United States (U.S. or US) or America, is a country consisting of 50 states, a federal district, five major self-governing territories, and various possessions. At 3.8 million square miles (9.8 million km2), it is the world's third or fourth-largest country by total area and the United States as fourth-largest at 9,526,468 sq km. This figure for the United States is less than the one cited in the ''CIA World Factbook'' because it excludes coastal and territorial waters.
The ''CIA World Factbook'' lists the United States as the third-largest country (after Russia and Canada) with total area of 9,833,517 sq km, and China as fourth-largest at 9,596,960 sq km. This figure for the United States is greater than in the ''Encyclopædia Britannica'' because it ''includes'' coastal and territorial waters.|name=largestcountry}} and is slightly smaller than the entire continent of Europe. Most of the country is located in central North America between Canada and Mexico. With an estimated population of over 328 million, the U.S. is the third most populous country in the world. The capital is Washington, D.C., and the most populous city is New York City.

Paleo-Indians migrated from Siberia to the North American mainland at least 12,000 years ago. European colonization began in the 16th century. The United States emerged from the thirteen British colonies established along the East Coast. Numerous disputes between Great Britain and the colonies led to the American Revolutionary War lasting between 1775 and 1783, leading to independence. The United States embarked on a vigorous expansion across North America throughout the 19th century—gradually acquiring new territories, displacing Native Americans, and admitting new states—until by 1848 it spanned the continent. During the second half of the 19th century, the American Civil War led to the abolition of slavery in the United States. The Spanish–American War and confirmed the country's status as a global military power.

The United States emerged from as a global superpower. It was the first country to develop nuclear weapons and the only country to have used them in warfare. During the Cold War, the United States and the Soviet Union competed in the Space Race, culminating with the 1969 Apollo 11 mission, the spaceflight that first landed humans on the Moon. The end of the Cold War and collapse of the Soviet Union in 1991 left the United States as the world's sole superpower.

The United States is a federal republic and a representative democracy. It is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States (OAS), NATO, and other international organizations. It is a permanent member of the United Nations Security Council.

A highly developed country, the United States is the world's largest economy by nominal GDP, the second-largest by purchasing power parity, and accounts for approximately a quarter of global GDP. The United States is the world's largest importer and the second-largest exporter of goods, by value. Although its population is 4% of the world total, it holds 31% of the total wealth in the world, the largest share of global wealth concentrated in a single country. Despite income and wealth disparities, the United States continues to rank very high in measures of socioeconomic performance, including average wage, median income, median wealth, human development, per capita GDP, and worker productivity. It is the foremost military power in the world, making up more than a third of global military spending, and is a leading political, cultural, and scientific force internationally. Provided by Wikipedia
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Published 1950
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by Douglas, Paul H. 1892-1976.
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by Wills, Garry, 1934-
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