Previously posted at: https://www.history.com/this-day-in-history/first-elected-female-senator
Ophelia Wyatt Caraway, a Democrat from Arkansas, becomes the first woman to be elected to the U.S. Senate. Caraway, born near Bakerville, Tennessee, had been appointed to the Senate two months earlier to fill the vacancy left by her late husband, Thaddeus Horatio Caraway. With the support of Huey Long, a powerful senator from Louisiana, Caraway was elected to the seat. In 1938, she was reelected. After failing to win renomination in 1944, she was appointed to the Federal Employees Compensation Commission by President Franklin Roosevelt.
Although she was the first freely elected female senator, Caraway was preceded in the Senate by Rebecca Latimer Felton, who was appointed in 1922 to fill a vacancy but never ran for election. Jeannette Rankin, elected to the House of Representatives as a pacifist from Montana in 1917, was the first woman to ever sit in Congress.