Jeannette Pickering Rankin (June 11, 1880 – May 18, 1973) was an American politician and women's rights advocate who became the first woman to hold federal office in the United States. She was elected to the U.S. House of Representatives as a Republican from Montana in 1916 for one term, then was elected again in 1940. Rankin remains the only woman ever elected to Congress from Montana.
Each of Rankin's congressional terms coincided with the initiation of U.S. military intervention in both world wars. A lifelong pacifist, she was one of 50 House members who opposed the declaration of war on Germany in 1917. In 1941, she was the sole member of Congress to vote against the declaration of war on Japan following the attack on Pearl Harbor. As of 2026, she remains the last member of Congress to vote against a declaration of war. The last time the United States actually issued a formal declaration of war was in June of 1942, when the United States declared war on Hungary, Romania, and Bulgaria, which Rankin abstained from.