Margaret Sanger is a pioneering feminist noted for her work in reproductive health, particularly in advocating for birth control access. In the early 20th century, she championed women's rights to make informed choices about their bodies and family planning. Sanger founded the first birth control clinic in the United States in 1916 and later established the Planned Parenthood Federation. Her activism and writings brought significant attention to issues of fertility control and women's health, leading to the eventual legalization of contraceptives. Sanger's efforts fundamentally transformed societal attitudes towards women's health and reproductive rights.