Early in his legendary “I Have A Dream” speech, Martin Luther King, Jr. assessed the unhappy situation of black Americans, a century after their emancipation. It is the darkest passage in a speech blazing with radiant imagery and uplifting messages of hope: "One hundred years later, the Negro still is not free. One hundred years later, the life of the Negro is still sadly crippled by the manacles of segregation and the chains of discrimination. One hundred years later, the Negro lives on a lonely island of poverty in the midst of a vast ocean of material prosperity. One hundred...