A defining feature of America from its inception has been physical mobility. And that physical mobility has been the engine of social mobility. But we’ve seen a great deal of economic and social sclerosis over the past few decades. Our guest this week has how, for many people, America has ceased to be the land of opportunity. Yoni Appelbaum is a deputy executive editor of The Atlantic, author of “Stuck: How the Privileged and the Propertied Broke the Engine of American Opportunity,” and a social and cultural historian of the U.S. He joins WITHpod to discuss how the idea of mobility has changed within the last century, how things might become less “stuck” and more.