Final answer:
The first national convention to discuss the United States Constitution was the 1787 Constitutional Convention held in Philadelphia, Pennsylvania. It resulted in the creation of the new U.S. Constitution, replacing the Articles of Confederation.
Step-by-step explanation:
The Constitutional Convention
The first national convention was the 1787 Constitutional Convention held in Philadelphia, Pennsylvania. This convention, initially intended to amend the Articles of Confederation, became the platform for drafting a completely new constitution for the United States. The catalysts leading up to this event included the Annapolis Convention of 1786 and several interstate issues such as economic problems and the need for improved trade regulations between states. Once the convention commenced, despite the original mandate, the delegates opted to design a new federal government rather than merely revising the existing Articles of Confederation.
Participants of the convention, which included notable figures such as George Washington, James Madison, and Alexander Hamilton, conducted their proceedings in secrecy to ensure open and uninhibited debate. The result of the convention was the creation of the United States Constitution, laying the foundation for the current form of the federal government. The new Constitution then required ratification by at least nine states, achieved through state conventions, to become the law of the land.