Jeannette Pickering Rankin, the first woman ever elected to Congress, takes her seat in the U.S. Capitol as a representative from Montana.

Born on a ranch near Missoula, Montana Territory, in 1880, Rankin was a social worker in the states of Montana and Washington before joining the women’s suffrage movement in 1910. Working with various suffrage groups, she campaigned for the women’s vote on a national level and in 1914 was instrumental in the passage of suffrage legislation in Montana. Two years later, she successfully ran for Congress in Montana on a progressive Republican platform calling for total women’s suffrage, legislation protecting children, and U.S. neutrality in the European war. Following her election as a representative, Rankin’s entrance into Congress was delayed for a month as congressmen discussed whether a woman should be admitted into the House of Representatives.

READ MORE: 7 Things You May Not Know About Jeannette Rankin