The history of the world has been in great part the history of the mixing of peoples. Modern communication and transport accelerate mass migrations from one continent to another. Ethnic and racial diversity is more than ever a salient fact of the age.
But what happens when people of different origins, speaking different languages and professing different religions, inhabit the same locality and live under the same political sovereignty? Ethnic and racial conflict -- far more than ideological conflict -- is the explosive problem of our times.
On every side today ethnicity is breaking up nations. The Soviet Union, India, Yugoslavia,...