178725 May – 17 September 1787 · Independence Hall, Philadelphia
Constitutional Convention

Fifty-five delegates met behind closed doors in the Pennsylvania State House to repair the weak Articles of Confederation and instead wrote a new frame of government, with George Washington presiding and James Madison as its leading drafter. The Constitution they signed created a federal republic with separated powers. Ratified in 1788, it is the oldest written national constitution still in force and a model for many others.
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