Margaret Sanger was an American birth control activist, sex educator, writer, and nurse. She opened the first birth control clinic in the United States, founded Planned Parenthood, and was instrumental in the development of the first birth control pill. Sanger is regarded as a founder and leader of the birth control movement.
In the early 1900s, contraceptives, abortion, and even birth control literature were illegal in much of the U.S. Working as a nurse in the slums of New York City, Sanger often treated mothers desperate to avoid conceiving additional children, many of whom had resorted to back-alley abortions. Sanger was a first-wave feminist and believed that women should be able to decide if and when to have children, leading her to campaign for the legalization of contraceptives. As an adherent of the eugenics movement, she argued that birth control would reduce the number of unfit people and improve the overall health of the human race. She was also influenced by Malthusian concerns about the detrimental effects of overpopulation. To promote birth control, Sanger gave speeches, wrote books, and published periodicals.