In Washington, D.C., the 19th Amendment to the U.S. Constitution, providing for female suffrage, is unanimously declared constitutional by the eight members of the U.S. Supreme Court. The 19th Amendment, which stated that “the right of citizens of the United States to vote shall not be denied or abridged by the United States or any State on account of sex,” was the product of over seven decades of meetings, petitions, and protests by women suffragists and their supporters.
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. Source