The 19th Amendment
Votes for women were first seriously proposed in the United States in July, 1848, at the Seneca Falls Woman's Rights Convention organized by Elizabeth Cady Stanton and Lucretia Mott.
After the first World War, the National American Woman Suffrage Association reminded the President and Congress that woman's war work should be rewarded by recognizing their political equality. President Wilson began to support woman suffrage.
Less than a year later, the House passed a proposed the following Amendment to the Constitution:
The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any States on Account of sex. The Congress shall have the power by appropriate legislation to enforce the provisions of this article.
After being endorsed by the Senate and ratified by thirty-six states, the Nineteenth Amendment to the United States Constitution became law on August 26, 1920, and women could vote in the fall elections, including in the Presidential election.
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