More at philosophytalk.org/shows/nations-and-borders.

Borders and immigration control restrict people from going where they want to pursue a better life. On the one hand there is the state’s need for security, self-determination, and a functioning economy. But why should arbitrary boundaries, based on past thefts of territory, limit a person's opportunities? Are borders essential to nationhood, or do they form an exclusive club that unfairly keeps certain people from pursuing a better life? John and Ken lift the gate for UC Berkeley Law Professor Sarah Song, author of "Justice, Gender, and the Politics of Multiculturalism."