The United States of America, also referred to as the United States, U.S.A., U.S., America, ¹ or the States, is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in the north and Mexico in the south, shares a marine border with Russia in the west, and has a collection of districts, territories, and possessions around the world. The country has fifty states, which have a level of local autonomy according to the system of federalism. A United States citizen is usually identified as an American. ¹

The United States traces its national origin to the declaration by thirteen British colonies in 1776 that they were free and independent states. Since the mid- 20th century, it has surpassed all other nations in contemporary economic, political, militaryMilitary (from latin militarius miles "soldier") as an adjective describes anything related to soldiers and warfare. Used as a noun, it is equivalent to Armed force. See also Armed force Martial art Militaria Military history Military rule Military by cou, and cultural influence.

The U.S. was founded under a tradition of government with the consent of the governed under the representative democracyRepresentative democracy comprises a form of democracy and theory of civics wherein voters choose (in free, secret, multi-party elections) representatives to act in their interests, but not as their proxies—i. not necessarily as directed but with enough a model. This model of government ( presidentialA presidential system or a congressional system is a system of government of a republic where the executive branch is elected separately from the legislative. The defining characteristic of a presidential government is how the executive is elected, but ne- congressional) has since been adopted by many other countries, mostly in Central AmericaCentral America is the region of North America located between the southern border of Mexico and the northwest border of Colombia, in South America. Some geographers classify Central America as a large isthmus, and in this geographic sense it sometimes in and South America.

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United States Executive Order 9066United States Executive Order 9066 was signed into law on February 19, 1942 (during World War II), by President Franklin D. Roosevelt, utilizing his authority as Commander in Chief to exercise war powers. This order authorized military commanders to decla	United States Office of Homeland SecurityOn October 8, 2001, in response to the September 11, 2001 attacks, President George W. Bush announced the establishment of an executive-level Office of Homeland Security to coordinate " homeland security" efforts, to be headed by Governor Tom Ridge with t	United States ConstitutionLaw for the United States of America The Constitution of the United States is the supreme law of the United States of America and is the oldest written national constitution still in force. It was completed on September 17, 1787, with its adoption by the
United KingdomThe United Kingdom of Great Britain and Northern Ireland is a state in Western Europe, usually known simply as the United Kingdom the UK Britain or less accurately as Great Britain . The UK was formed by a series of Acts of Union which united the formerly	United States CongressThe United States Congress is the legislative branch of the United States federal government. The structure and responsibilities of Congress are defined in Article One of the United States Constitution. The United States Congress is bicameral, meaning tha	United States SenateThe United States Senate is the upper house of the United States Congress, smaller than the U. House of Representatives. Together, they compose the legislative branch of the United States government. Seal of the Senate Each state elects two senators throu
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