Six months ago, Ferguson, Missouri, was the kind of nameless suburb visitors to the city of St. Louis passed through. That was before a white police officer shot an unarmed black teenager on a street this summer and months of daily protests transformed the unassuming city into a symbol. Ferguson is now a word that evokes feelings. Though it has been less than four months since Michael Brown was killed, the town seems to have entered the pantheon of places that stand as metaphors. Ferguson’s symbolism now sits alongside Selma’s significance in the civil rights movement, Columbine as a symbol...