1920: The 19th Amendment is official!
The ratification of the 19th Amendment to the Constitution, which extended the vote to women, was officially certified on August 26, 1920. Tennessee was the 36th state to ratify the amendment on August 18, giving the amendment the approval of three-fourths of the states.
The campaign for woman suffrage took about 100 years. In the 1820s and 1830s, women had roles in reform groups that began to give voice to the movement. The constitutional amendment was first introduced in 1878 and was promoted by such prominent advocates for women’s rights as Susan B. Anthony, Elizabeth Cady Stanton, and Lucretia Mott.
There’s more about the 19th Amendment at Our Documents http://ourdocuments.gov/doc.php?doc=63