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PROJECT NARRATIVE Between 1907 and the mid-1970s, 32 US states passed and implemented eugenic sterilization laws that authorized the sterilization of people considered unfit. Our epidemiological, historical and mixed-methods analysis of over 32,000 eugenic sterilization requests in five US states (California, North Carolina, Iowa, Michigan and Utah) identifies varying demographic patterns and documents changes in how eugenics laws were applied over time.