The Campaigner.

Women from all economic classes gained greater ability to limit pregnancy in the 1920s as a result of the effort of nurse and birth control advocate Margaret Sanger, who vowed to "do something to change the destiny of mothers whose miseries were as vast as the sky." By 1914 Sanger was determined to remove the stigma of obscenity from contraception and to set up a nationwide network of advice centers on birth control for women. She first had to find a safe, reliable method of birth control and, in 1915, traveled to Europe, where she learned about the diaphragm. By the 1920s Sanger broke her ties with radical colleagues, a shift in approach that won her the support of powerful, conservative groups such as physicians, philanthropists, and wealthy women.

The Triumph.

In 1921 Sanger organized the American Birth Control League, which changed its...