Who was the first female Supreme Court Justice?

Sandra Day O'Connor holds the distinction of being the first female Supreme Court Justice in the United States. Appointed by President Ronald Reagan in 1981, she served on the Supreme Court until her retirement in 2006. O'Connor's appointment marked a significant milestone in American history, as she broke the gender barrier within the highest court and paved the way for future female justices. Her judicial career included making critical decisions on issues ranging from reproductive rights to affirmative action, influencing the legal landscape of the nation. Her strong moderate stance and ability to build consensus made her a pivotal figure on the Court.