Detroit's recent bankruptcy filing led me to re-read a fine award-winning book by Thomas J. Sugrue, “The Origins of the Urban Crisis: Race and Inequality in Postwar Detroit.” The basic argument of the book is that the crisis of that city  – now a mainly black, overwhelmingly poor city, a fraction of its former size and a shadow of its former magnificence  – is deeply rooted in persistent discrimination against blacks at the workplace and in housing.