Andrew J. Cherlin's three decades of study have shown him that marriage in America is a social and political battlefield in a way that it isn’t in other developed countries. Americans marry and divorce more often and have more live-in partners than Europeans, and gay Americans have more interest in legalizing same-sex marriage. The difference comes from Americans’ embrace of two contradictory cultural ideals: marriage, a formal commitment to share one's life with another; and individualism, which emphasizes personal choice and self-development. Cherlin’s incisive diagnosis is an important contribution to the debate and points the way to slowing down the partnership merry-go-round.