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The U.S. Constitution requires three-fourths of the states to ratify an amendment. On June 4, 1919, Congress proposed an amendment enfranchising women. Within a month, Missouri became the eleventh state to ratify it. Tennessee’s ratification on August 18, 1920, met the requirement for 36 of the 48 states, and the Nineteenth Amendment was added to the Constitution.
Records of the U.S. House of Representatives, National Archives and Records Administration