Which member of Congress voted against declaring war on Japan after Pearl Harbor?

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The member of Congress who cast the sole dissenting vote against declaring war on Japan following the attack on Pearl Harbor was Jeannette Rankin, a Republican representative from Montana.12

Rankin was a committed pacifist whose opposition to the war was consistent with her earlier vote against entering World War I in 1917. Her vote on December 8, 1941, was the only dissenting voice in the House of Representatives, and it effectively ended her political career.12