To tens of thousands of volunteers in its first decade, the Peace Corps was "the toughest job you'll ever love." In the United States' popular imagination to this day, it is a symbol of selfless altruism and the most successful program of John F. Kennedy's presidency. But in her provocative new cultural history of the 1960s Peace Corps, Molly Geidel argues that the agency's representative development ventures also legitimated the violent exercise of American power around the world and the destruction of indigenous ways of life.

In the 1960s, the practice of development work, embodied...