Don't Know Much About® the 19th Amendment

It took 144 years after Independence. But on August 26, 1920–90 years ago– the "other half" of the country got their rights. The 19th Amendment to the Constitution, giving women the vote, was declared in effect on this date by the Secretary of State. The Amendment had actually been ratified earlier in the month when Tennessee gave its approval on August 18, 1920.

http://www.ourdocuments.gov/doc.php?flash=old&doc=63

Here's a quick history of the movement from Don't Know Much About History
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