Which 1787 convention drafted the Constitution of the United States?

The Constitutional Convention drafted the Constitution of the United States in 1787.

Delegates met in Philadelphia from May 25 to September 17, 1787. Although the meeting was initially called to revise the Articles of Confederation, the delegates ultimately designed an entirely new framework for the federal government.

George Washington presided over the convention. Major compromises addressed representation, the balance between large and small states, slavery and congressional apportionment, and the relationship between federal and state authority.

The convention approved the Constitution on September 17, 1787, but it did not itself put the document into effect. Ratification by nine states was required, and the Constitution became operative after New Hampshire supplied the ninth ratification in June 1788. The new government began in 1789.