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In 1920 she published What Every Girl Should Know, which was later widely distributed as one of the Haldeman-Julius "Little Blue Books," which not only provided basic information not only such topics as menstruation, but also acknowledged the reality of sexual feelings in adolescents.
After she returned to the country she founded the American Birth Control League in 1921 as well as Planned Parenthood of America in 1942.
In recent years, Sanger has been criticized for her outspoken advocacy of eugenics and an appearance at a Ku Klux Klan rally, both of which her critics associate with racism.