<P> Paleo - Indians migrated from Asia to the North American mainland at least 15,000 years ago . 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 following the Seven Years ' War led to the American Revolution , which began in 1775 , and the subsequent Declaration of Independence in 1776 . The war ended in 1783 with the United States becoming the first country to attain independence from a European power . The current constitution was adopted in 1788 . The first ten amendments , collectively named the Bill of Rights , were ratified in 1791 and designed to guarantee many fundamental civil liberties . </P>
<P> Paleo - Indians migrated from Asia to the North American mainland at least 15,000 years ago . 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 following the Seven Years ' War led to the American Revolution , which began in 1775 , and the subsequent Declaration of Independence in 1776 . The war ended in 1783 with the United States becoming the first country to attain independence from a European power . The current constitution was adopted in 1788 . The first ten amendments , collectively named the Bill of Rights , were ratified in 1791 and designed to guarantee many fundamental civil liberties . </P>
when was the us founded as a country
when was the us founded as a country
1776
1776