A century after W.E.B. DuBois wrote about "the color line" and 50 years after the start of the civil rights movement, author and Harvard professor Henry Louis Gates, Jr. travels to four diverse parts of the country to explore the progress (or lack thereof) African-Americans have made, and what challenges lie ahead. Colin Powell, Jesse Jackson, Quincy Jones, Maya Angelou, and Morgan Freeman are among the people Gates talks to in "Chicago: Streets of Heaven," "East Coast: Ebony Towers," "Los Angeles: Black Hollywood," and "South: The Black Belt." 3 3/4 hrs. total. Widescreen; Soundtrack: English Dolby Digital stereo; interview.