Source: The Huffington Post/USA Today
One hundred years ago, the great African-American scholar W.E.B. DuBois famously wrote, "The problem of the 20th century will be the problem of the color line."
History proved DuBois correct. His century saw the struggles against, and ultimately the victory over, systems that separated and subjugated people based on race -- from colonialism in India to Jim Crow in the U.S. to apartheid in South Africa.