With new data out on the fastest-whitening zip codes in America, major US cities—New York and Washington DC, especially—are experiencing cultural and electoral shifts that current policy may not be evolved enough to handle. Are we self-segregating as we get more diverse? What does balanced integration look like? On his show Sunday, Nation editor-at-large Chris Hayes asks what policies the country needs to confront urban gentrification. Columbia University architecture professor Michael Bell and Ta-Nehisi Coates of The Atlantic weigh in.