United States of America

From ePedia, the electronic encyclopedia
The United States of America is a federal republic situated primarily in North America. It is bordered on the north by Canada and to the south by Mexico. It comprises 50 states and one federal district, and has several territories with differing degrees of affiliation. It is also referred to, with varying formality, as the United States, America, the U.S., the U.S.A., the U.S. of A., the States, or (poetically) Columbia.

Since the 20th century, following World War I, the United States has emerged as the dominant global influence in economic, political, military, cultural and technological affairs. It is often regarded as today's sole global superpower.

The country celebrates its founding date as July 4, 1776, when the Second Continental Congress—representing thirteen British colonies—adopted the Declaration of Independence that rejected British authority in favor of self-determination. The structure of the government was profoundly changed on March 4, 1789, when the states replaced the Articles of Confederation with the United States Constitution.

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