What year did the United States of America come into existence?

and brief history of US and as well as some historic events leading to its present regime political.

Need information asap

The USA be not founded when Columbus came to America. The colonies were under British rule until the American Revolution. The colonies declared their nouns from the British on July 4, 1776. The Revolutionary war (by which we won our independence) ended on September 3, 1783, when the U.S. and Britain signed the Treaty of Paris. The last British troops disappeared New York in November, 1783. The U.S. Constitution was ratified surrounded by 1787. The referenced link gives a timeline for the events of the Revolutionary War. Source(s): http://www.ushistory.org/declaration/rev…
-America was founded surrounded by October 12, 1492 by Christopher Columbus.
-American gained it's independence from Great Britain and became a country on July 4, 1776.

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