The U.S. Constitution was written in the summer of 1787 in Philadelphia by delegates from 12 states during the Constitutional Convention. While many delegates contributed to its creation, James Madison is known as the "Father of the Constitution" due to his significant role in drafting and shaping the document. George Washington presided over the Convention, and Gouverneur Morris wrote the Constitution’s final language. The Constitution was a collaborative effort among many framers, often called the Founding Fathers, who brought together ideas from various sources to form the new government framework

. In summary, the Constitution was primarily written by the delegates at the 1787 Constitutional Convention, with James Madison playing a central role as its principal author.