"We are entering a new period in the history of the American melting pot. Immigration has stopped, for one thing, and assimilation has begun. A bigger factor, however, is the great social change going on in America, a process that inevitably lines up the poor against the money-bags, the trade unionists against the exploiters, the men who battle for human rights against those who fight for property rights. Race lines vanish in such a conflict; the class issue cuts through everything. Even the Negro question is affected and will finally be settled as this fight goes on; and this question is surely the touchstone of all racial problems in America."