It was finally adopted on the 4th afternoon of July, 1776. Thomas Jefferson was declared the principal author of the historical document due to his skills and strong opinions about liberty. On the other hand, the U.S. Constitution was written in the year 1787, after the Declaration of Independence. There were actually a number of delegates that attended the Constitutional Convention in Philadelphia during 1787, but only a few played a role in the completion of the Constitution. James Madison, known as the Father of the Constitution, co-wrote it with Alexander Hamilton, Benjamin Franklin, and so much more. After many yeses’ and no’s, the U.S. Constitution was finally approved and sanctioned in 1788 and has been in operation since 1789. "“The Declaration of Independence...[is the] declaratory charter of our rights, and of the rights of man.”"— Thomas Jefferson, 1819. This was a quote taken from the Taken from The Declaration of Independence – USCIS. The Declaration of Independence became the bedrock of brave citizens who rose up against tyranny and were committed to