William H. Frey, a senior fellow in the Metropolitan Policy Program at Brookings, talks about his collaborative research project, "States of Change," which explores demographic change and its effects on the U.S. electorate and politics. Also in this episode, Senior Fellow Jonathan Pollack talks about the threat from North Korea in an installment of the Unpacked series. Subscribe to Brookings podcasts here or on iTunes, send feedback email to BCP@Brookings.edu, and follow us and tweet us at @policypodcasts on Twitter. The Brookings Cafeteria is a part of the Brookings Podcast Network.