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Calls for woman suffrage began in the 1840s. Three decades later, the first resolution for a constitutional amendment extending voting rights to women was introduced in Congress, but it failed. The suffrage movement gained strength in the twentieth century, culminating with congressional approval of the Nineteenth Amendment in 1919 and its ratification by three-fourths of the states on August 26, 1920.
Records of the U.S. Senate, National Archives and Records Administration