Constitution: previous 1781 (Articles of Confederation and Perpetual Union); latest drafted July - September 1787, submitted to the Congress of the Confederation 20 September 1787, submitted for states' ratification 28 September 1787, ratification completed by nine states 21 June 1788, effective 4 March 1789; amended many times, last in 1992 (2016)
Definition: This entry includes the dates of adoption, revisions, and major amendments.
Source: CIA World Factbook - This page was last updated on July 9, 2017
