The framers of our Constution were, in fact, born here but at the time of their birth they were still subject to the rule of England. They became American citizens when America became a sovereign nation after they declared their independence from England by ratifying the Declaration of Independence. This happened a full 284 years after the pilgrims landed at Plymouth Rock. They eventually defeated the British army and sent them home with their tails tucked.
Between 1492 and 1776 the colonies, which stretched from present-day Maine to Georgia, built cities, developed the Army, Navy, and Marines, and were self sufficient in every way. By this time the various colonies were comprised of settlers, including Scots, Welsh, Irish, Dutch, Swedes, Finns, Africans, French, Germans, Latins, Swiss, and English.
They were subject to the Magna Carta, which was a just agreement with England which defined their relationship. However, King George, contrary to the Magna Carta, began to tax the colonies unjustly, so they rebelled. The rebellion resulted in the War of Independence, led by George Washington, and victory in that war established The United States of America as a free and independent nation.
I challenge each of you to log into the site, Charters of Freedom and read the Declaration of Independence, the Constitution, and The Bill of Rights for yourself.