Homicide remains an endemic, seemingly unsolvable problem in America. And violent crime afflicts African-American communities to a much greater degree than it does others, as does mass incarceration — and as does police violence. What is the cause of this crisis? What role does racism play? What is the role of culture? Are there any solutions to be had? The mayor of New Orleans, Mitch Landrieu, has been confronting this crisis head-on, and Atlantic Magazine National Correspondent Ta-Nehisi Coates has written widely on matters of race, policing and American history.