Published online by Cambridge University Press: 17 May 2016
Biographical data were collected on members of the U.S. executive, legislative, and judicial branches, in George Washington's first through Ronald Reagan's last administration, from Who Was Who in America, the Biographical Dictionary of the United States Congress, Vice Presidents and Cabinet Members, and Burke's Presidential Families of the United States of America. They suggest that serial polygyny in this sample has declined over the last two hundred years. Census data on average American men suggest that the number of wives per man has stayed the same or increased at the same time. These trends imply that mating equality may have increased over the last two centuries of American history. What sketchy evidence exists on extramarital opportunities tentatively suggests a similar trend.