Gates says white supremacy was born in the years after the Civil War, as white Southerners looked for ways to roll back the newly acquired rights of African-Americans. His new book is Stony the Road.
As host of the PBS series Finding Your Roots, Gates tells celebrities about their family history. He reflects on his own history and some of the more controversial aspects of DNA testing.
Frontline correspondent and Harvard University professor Henry Louis Gates, Jr. Gates hosts a Frontline segment called "Two Nations of Black America" which airs Tuesday night on PBS. Today, America has the largest black middle class in its history, yet half of all black children are born into poverty. (Interview by Barbara Bogaev)