Sandra Day O'Connor became the first female Supreme Court Justice in the United States. Appointed by President Ronald Reagan, she took her seat on September 25, 1981, marking a significant milestone in the history of the U.S. judiciary. Before her appointment, O'Connor had a distinguished legal career, serving as a state senator and a judge on the Arizona Court of Appeals. Her tenure on the Supreme Court was marked by her pragmatic and moderate judicial philosophy, often serving as a pivotal swing vote in major cases. O'Connor’s appointment opened the door for more women in the judiciary, inspiring future generations.