The problem of the twentieth century is the problem of the color-line -- the relation of the darker to the lighter races of men in Asia and Africa, in America and the islands of the sea. It was a phase of this problem that caused the Civil War.
William Edward Burghardt Du Bois (February 23, 1868 - August 27, 1963) was an American civil rights activist, leader, sociologist, educator, historian, writer, editor, poet, scholar, and socialist. He became a naturalized citizen of Ghana in 1963 at the age of 95. David Levering Lewis, his acclaimed biographer, wrote, "In the course of his long, turbulent career, W.E.B. Du Bois attempted virtually every possible solution to the problem of twentieth-century racism-scholarship, propaganda, integration, cultural and economic separatism, politics, international communism, expatriation, third world solidarity.