Answer:
The tide finally started to shift in suffragists’ favor in 1917, when the U.S. entered World War I (1914-18). As men went to fight, women took over their jobs on railroads and in factories.
Women’s value to society was suddenly undeniable. Now President Wilson also endorsed women’s suffrage. In 1919, Congress passed an amendment to the U.S. Constitution that would guarantee women the vote.
But as with all amendments, three-fourths of the states had to ratify it. Some Southern states were opposed, but by August 1920, 35 states had approved the measure—one fewer than the 36 required. Finally, Tennessee became the 36th state to ratify the 19th Amendment. It was signed into law on August 26.
Women across the U.S. took to the streets in celebration. And in the election that November, millions of women cast ballots for the first time.