Suffragists parade down Fifth Avenue, 1917. Advocates march in October 1917, displaying placards containing the signatures of more than one million New York women demanding the vote. — The New York Times Photo Archives

In 1916, the Democratic and Republican parties endorsed female enfranchisement, and on June 4, 1919, the 19th Amendment was passed by Congress and sent to the states for ratification. On August 18, 1920, Tennessee became the 36th state to ratify the amendment, achieving the required three-fourths majority of state ratification, and on August 26 the 19th Amendment officially took effect.

Reference