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United States Of America Alabama  Alaska  Arizona  Arkansas  California  Colorado  Connecticut  Delaware  Florida  Georgia  Hawaii  Idaho  Illinois  Indiana  Iowa  Kansas  Kentucky  Louisiana  Maine t  Maryland  Massachusetts  Michigan  Minnesota  Mississippi  Missouri  Montana  Nebraska Nevada New Hampshire New Jersey  New Mexico  New York North Carolina  North Dakota  Ohio  Oklahoma  Oregon  Pennsylvania  Rhode Island    South Carolina  South Dakota  Tennessee  Texas  Utah  Vermont  Virginia  Washington  Washington, D.C.  West Virginia  Wisconsin  Wyoming  Arts and Entertainment  Business and Economy  Education  Employment  Government  Health  Real Estate  Recreation and Sports  Science and Environment  Shopping  Society and Culture  Travel and Tourism      The United States of America also known as the United States, the U.S., the USA, or America is a federal constitutional republic of fifty states and a federal district.  The United States was founded by thirteen British colonies located along the Atlantic seaboard. On July 4, 1776, they issued the Declaration of Independence, which proclaimed their right to self-determination and their establishment of a cooperative union. The rebellious states defeated the British Empire in the American Revolution, the first successful colonial war of independence. The current United States Constitution was adopted on September 17, 1787; its ratification the following year made the states part of a single republic with a strong central government. The Bill of Rights, comprising ten constitutional amendments guaranteeing many fundamental civil rights and freedoms, was ratified in 1791. In the 19th century, the United States acquired land from France, Spain, the United Kingdom, Mexico, and Russia, and annexed the Republic of Texas and the Republic of Hawaii.  The United States is a constitutional republic and representative democracy. The government is regulated by a system of checks and balances defined by the U.S. Constitution, which serves as the country's supreme legal document. The United States is one of the world's most ethnically diverse and multicultural nations, the product of large-scale immigration from many countries. The U.S. economy is the world's largest national economy.     1