United States

The [[Cliff Palace The United States of America (U.S.A. or USA), commonly known as the United States (U.S. or US) or America, is a country primarily located in North America. It consists of 50 states, a federal district, five major unincorporated territories, 326 Indian reservations, and some minor possessions. At , it is the world's third- or fourth-largest country by total area.

Coastal/territorial waters excluded: |name=largestcountry}} The United States shares significant land borders with Canada to the north and Mexico to the south as well as limited maritime borders with the Bahamas, Cuba, and Russia. With a population of more than 331 million people, it is the third-most populous country in the world. The national 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, and European colonization began in the 16th century. The United States emerged from the thirteen British colonies established along the East Coast. Disputes with Great Britain over taxation and political representation led to the American Revolutionary War (1775–1783), which established the nation's independence. In the late 18th century, the U.S. began expanding across North America, gradually obtaining new territories, sometimes through war, frequently displacing Native Americans, and admitting new states; by 1848, the United States spanned the continent. Slavery was legal in the southern United States until the second half of the 19th century when the American Civil War led to its abolition. The Spanish–American War and established the U.S. as a world power, a status confirmed by the outcome of .

During the Cold War, the United States fought the Korean War and the Vietnam War but avoided direct military conflict with the Soviet Union. The two superpowers competed in the Space Race, culminating in the 1969 spaceflight that first landed humans on the Moon. The Soviet Union's dissolution in 1991 ended the Cold War, leaving the United States as the world's sole superpower.

The United States is a federal republic and a representative democracy with three separate branches of government, including a bicameral legislature. It is a founding member of the United Nations, World Bank, International Monetary Fund, Organization of American States, NATO, and other international organizations. It is a permanent member of the United Nations Security Council. Considered a melting pot of cultures and ethnicities, its population has been profoundly shaped by centuries of immigration. The U.S. ranks high in international measures of economic freedom, quality of life, education, and human rights. However, the country has been criticized for inequality related to race, wealth, and income; use of capital punishment; high incarceration rates; and lack of universal health care.

The United States is a highly developed country, accounts for approximately a quarter of global GDP, and is the world's largest economy by GDP at market exchange rates. By value, the United States is the world's largest importer and second-largest exporter of goods. Although its population is only 4.2% of the world's total, it holds 29.4% of the total wealth in the world, the largest share held by any country. Making up more than a third of global military spending, it is the foremost military power in the world and a leading political, cultural, and scientific force internationally. Provided by Wikipedia

by United States Department of Defense
Published 1983
Springer New York

by Native citizen of the United States
Published 1818
Subjects: '; ...Inventions / United States...

by Citizen of the United States
Published 1796
Printed by Henry Tuckniss, for Mathew Carey, no. 118, Market-Street
Subjects: '; ...Great Britain / Treaties, etc / United States / 1794 Nov. 19...

by Senator of the United States
Published 1796
Printed by Samuel Harrison Smith, no. 118, Chesnut-Street
Subjects: '; ...Treaty-making power / United States...

by HighQuest Partners, United States,
Published 2010
OECD Publishing

7 ... of Australian researchers in this field were present in the United States. or en route thereto, at about...

by Rose, Walter Malins
Published 1907
Subjects: '; ...Civil procedure / United States...

by Fenton, Horace Jewell
Published 1914
U.S. Naval Institute
Table of Contents: '; ...The Articles of Confederation -- The Constitution of the United States...

by Hickey, William
Published 1848
Printed by T.K. & P.G. Collins
...United States...

by Laidlaw, Alexander Hamilton
Published 1888
Laidlaw Bros
...United States...

by Hickey, William
Published 1851
Printed by T.K. & P.G. Collins
...United States...

by Oppenheimer, William Henry
Published 1917
Subjects: '; ...Bankruptcy / United States...

by Brandenburg, Edwin Charles
Published 1903
Subjects: '; ...Bankruptcy / United States...

by Loveland, Franklin Olds
Published 1907
W.H. Anderson
Subjects: '; ...Bankruptcy / United States...

by Brandenburg, Edwin Charles
Published 1901
Subjects: '; ...Bankruptcy / United States...

by Mosher, Robert Brent
Published 1905
...United States...

by Johnson, Rossiter
Published 1910
Wessels & Bissell Co
Subjects: '; ...Constitutional law / United States...

by Snyder, William Lamartine
Published 1904
Baker, Voorhis
Subjects: '; ...Antitrust law / United States...

by Willoughby, Westel Woodbury
Published 1912
Baker, Voorhis & Co
Subjects: '; ...Constitutional law / United States / Cases...