Only 36 women have been elected to the U.S. Senate. Arkansas's Hattie Caraway was the first in 1932.

Today, although women make up 51% of the U.S. population, they hold 24% of U.S. Senate seats. Eighteen states have never elected a woman to the U.S. Senate.

Overall, according to the Interparliamentary Union, the U.S. ranks 68th of 195 countries for women's legislative representation.

Read more about women serving in Congress at the Pew Research Center's website »

— Sponsored by the Chancellor's Commission on Women