On this day in US history, 55 state delegates convened in Philadelphia on May 25, 1787, to compose a new constitution, four years after the US won its independence from Great Britain. Soon after the British surrender at Yorktown in 1781, the Articles of Confederation served as a placeholder for the soon-to-be US Constitution. After three months of debate, the delegates proposed a federal system characterized by intricate checks and balances, which was ratified on March 4, 1789.


