January 1918, the woman suffrage amendment passes the House of Representatives with the necessary two-thirds majority vote.
June 1919, it was approved by the Senate and sent to the states for ratification. Campaigns were waged by suffragists around the country to secure ratification.
August 18, 1920, Tennessee became the 36th state to ratify the amendment, giving it the three-fourths majority of state ratification necessary to make it the law of the land.
August 26, 1920, The package containing the certified record of the action of the Tennessee legislature was sent by train to the nation’s capital. At 8 a.m. that morning, Secretary of State Bainbridge Colby signed it without ceremony at his residence in Washington. None of the leaders of the woman suffrage movement were present when the proclamation was signed, and no photographers or film cameras recorded the event. That afternoon, Carrie Chapman Catt, head of the National American Suffrage Association, was received at the White House by President Woodrow Wilson and Edith Wilson, the first lady.