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The United States of America, commonly referred to as the United States (U.S.) or America, is a constitutional federal republic composed of 50 states, a federal district, five major self-governing territories, and various possessions.[fn 1] Forty-eight of the fifty states and the federal district are contiguous and located in North America between Canada and Mexico. The state of Alaska is in the northwest corner of North America, bordered by Canada to the east and across the Bering Strait from Russia to the west. The state of Hawaii is an archipelago in the mid-Pacific Ocean. The U.S. territories are scattered about the Pacific Ocean and the Caribbean Sea. Nine time zones are covered. The geography, climate and wildlife of the country are extremely diverse.[21] At 3.8 million square miles (9.8 million km2)[19] and with over 324 million people, the United States is the world's fourth-largest country by total area (and fourth-largest by land area)[fn 2] and the third-most populous. It is one of the world's most ethnically diverse and multicultural nations, and is home to the world's largest immigrant population.[26] Urbanization climbed to over 80% in 2010 and leads to growing megaregions. The country's capital is Washington, D.C. and its largest city is New York City; the other major metropolitan areas, all with around five million or more inhabitants, are Los Angeles, Chicago, San Francisco, Boston, Dallas, Philadelphia, Houston, Miami, and Atlanta. Paleo-Indians migrated from Asia to the North American mainland at least 15,000 years ago.[27] European colonization began in the 16th century. The United States emerged from 13 British colonies along the East Coast. Numerous disputes between Great Britain and the colonies in the aftermath of the Seven Years' War led to the American Revolution, which began in 1775. On July 4, 1776, as the colonies were fighting Great Britain in the American Revolutionary War, delegates from the 13 colonies unanimously adopted the Declaration of Independence. The war ended in 1783 with recognition of the independence of the United States by Great Britain, and was the first successful war of independence against a European colonial empire.[28] The current constitution was adopted in 1788, after the Articles of Confederation, adopted in 1781, were felt to have provided inadequate federal powers. The first ten amendments, collectively named the Bill of Rights, were ratified in 1791 and designed to guarantee many fundamental civil liberties. The United States embarked on a vigorous expansion across North America throughout the 19th century,[29] displacing American Indian tribes, acquiring new territories, and gradually admitting new states until it spanned the continent in 1848.[29] During the second half of the 19th century, the American Civil War led to the end of legal slavery in the country.[30][31] By the end of that century, the United States extended into the Pacific Ocean,[32] and its economy, driven in large part by the Industrial Revolution, began to soar.[33] The Spanish–American War and World War I confirmed the country's status as a global military power. The United States emerged from World War II as a global superpower, the first country to develop nuclear weapons, the only country to use them in warfare, and a permanent member of the United Nations Security Council. It is a founding member of the Organization of American States (OAS) and various other Pan-American and international organizations. The end of the Cold War and the dissolution of the Soviet Union in 1991 left the United States as the world's sole superpower.[34] The United States is a highly developed country, with the world's largest economy by nominal GDP. It ranks highly in several measures of socioeconomic performance, including average wage,[35] human development, per capita GDP, and productivity per person.[36] While the U.S. economy is considered post-industrial, characterized by the dominance of services and knowledge economy, the manufacturing sector remains the second-largest in the world.[37] Though its population is only 4.3% of the world total,[38] the United States accounts for nearly a quarter of world GDP[39] and over a third of global military spending,[40] making it the world's foremost economic and military power. The United States is a prominent political and cultural force internationally, and a leader in scientific research and technological innovations.[41]

INTO JAPANESE

アメリカ合衆国、アメリカ合衆国 (米国) またはアメリカと呼ばは 50 州、連邦区、5 つの主要な自治地域、様々 な所有物から成る立憲連邦共和国。[fn 1]50 の州と連邦区の 48 は、連続した北アメリカの間に位置します。

BACK INTO ENGLISH

United States of America, United States of America (United States) or America and referred to as the 50 States, is a constitutional Federal Republic consisting of Federal District, five major autonomous regions, various possessions. 48 [fn 1] 50 States and federal district lies between the contiguous North America.

INTO JAPANESE

アメリカ合衆国のアメリカ、アメリカ合衆国 (米国) またはアメリカ、50 の州と呼ばれる、憲法連邦区から成る連邦共和国、五つの自治区、様々 な財産。48 [fn 1] 50 の州および連邦区の間にある連続した北アメリカ。

BACK INTO ENGLISH

50 States of the United States of America, United States of America (United States) or America and known, from Distrito Federal Constitution of the Federal Republic, of the five boroughs, with various property. 48 contiguous North America located between the [fn 1] 50 States and Federal District.

INTO JAPANESE

アメリカ合衆国、アメリカ合衆国 (米国) またはアメリカ、知られている、中央政府共和国、様々 なプロパティを持つ、5 つの自治区の区連邦憲法からの 50 の州。48 の連続した北アメリカは、50 州と連邦区 [fn 1] の間にあります。

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50 from the Borough of five known United States of America, United States of America (United States) or America, and with the Federal Republic, a variety of properties, Federal Constitution states. Of the 48 contiguous United States, the 50 States and, during the Federal District [fn 1].

INTO JAPANESE

中央政府共和国、さまざまなプロパティと 5 つの知られているアメリカ合衆国、アメリカ合衆国 (米国) またはアメリカの自治区から 50 連邦の憲法します。50 の州の 48 連続したアメリカ合衆国と、連邦区 [fn 1] 中。

BACK INTO ENGLISH

From the autonomous region of the Federal Republic, a variety of properties and known United States 5, United States of America (United States) or American 50 the Federal Constitution. 50 States 48 contiguous United States and in the Federal District [fn 1].

INTO JAPANESE

さまざまなプロパティと知られているアメリカ合衆国 5、アメリカ合衆国 (米国) またはアメリカ 50 米国憲法、中央政府共和国の自治区。50 の州の 48 連続した米国、連邦区 [fn 1]。