Martin Van Buren was the first US President to be born in the US after the Declaration of Independence was signed on July 4, 1776. He was born on December 5, 1782 in Kinderhook, NY.

The first reference of the United States of America was in January 1776 in a letter from one of General Washington's aides. The first publication to use the term was The Virginia Gazette in April 1776. John Dickinson used the term "...United States of America in the second draft of the Articles of Confederation and future US President Thomas Jefferson wrote it in all capital letters atop the Declaration of Independence.

Almost 13 years later, after ratification of the US Constitution, the first US President was elected and inaugurated.

John Tyler was the first US President born after the ratification of the US Constitution.

Both George Washington and Thomas Jefferson were born in the English colony Virginia.

Every American president was born in what is now the USA. Even the one born on a tropical island...

More Info: en.wikipedia.org