Who was the first woman elected to U.S. Congress?

Jeanette Rankin, a Republican from Montana, was the first woman elected to Congress on November 6, 1916. Jeannette Rankin was the first woman elected to the U.S. Congress, and the first woman elected to a national legislature in any western democracy.

Source: http://womenshistory.about.com/od/congress/a/jeanette_rankin.htm