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September 17: The United States Constitution is signed by delegates of the 13 member states in Philadelphia.
1787 (MDCCLXXXVII) was a common year starting on Monday of the Gregorian calendar and a common year starting on Friday of the Julian calendar, the 1787th year of the Common Era (CE) and Anno Domini (AD) designations, the 787th year of the 2nd millennium, the 87th year of the 18th century, and the 8th year of the 1780s decade. As of the start of 1787, the Gregorian calendar was 11 days ahead of the Julian calendar, which remained in localized use until 1923.