A lot has been written about Baltimore recently, but the most insightful commentary often comes from people who are not directly addressing the news. Back in 2010, Antero Pietila wrote Not in My Neighborhood: How Bigotry Shaped a Great American City about Baltimore (h/t Tyler Cowen). The shaping was not subtle. Indeed, with a 1910 residential segregation ordinance passed by the City Council, Charm City literally invented the idea of legally enforcing neighborhood-level segregation: Baltimore's innovation was the use of government legislation to achieve systematic, citywide race separation. "Nothing like it can be found in any statute book or ordinance...