There was a time when geographic mobility defined America — one-third of the population relocated each year, chasing better jobs and brighter futures. But today, historian and journalist Yoni Appelbaum argues in his new book, Stuck: How the Privileged and the Propertied Broke the Engine of American Opportunity, that America’s once-robust engine of upward mobility is grinding to a halt. Appelbaum challenges the long-held belief that income alone dictates housing choices. Instead, he reveals how restrictive housing policies — exclusionary zoning, historical redlining, and modern NIMBYism — have dramatically limited the supply of new housing, effectively blocking the paths that families once took toward prosperity. Today, affluent neighborhoods, often proudly progressive, tout diversity while quietly building invisible walls against newcomers, turning geographic mobility into a privilege reserved mainly for the wealthy. The result is profound economic stagnation, deepening political polarization, and psychological harm — leaving millions trapped, angry, and increasingly cynical about the future. Yet despite the immense costs, estimated at $2 trillion annually, Appelbaum sees genuine hope.