This program features two African-American politicians from different generations and opposite backgrounds. John Lewis grew up in a sharecropping family in rural Georgia, while Cory Booker was raised in an affluent, all-white New Jersey suburb. Although both men have devoted their lives to the betterment of African-American people, neither knows much about his own ancestors. In this episode, Booker is introduced to his white great-grandfather, a man he never knew, and Lewis is moved to tears over the extraordinary ambitions and accomplishments of his slave ancestors.

What’s in a name? Well, a lot, at least when it comes to piecing together family history. For former slaves, choosing a last name was one of their first acts of freedom. For Jewish immigrants, it was a way to fit in in their new country. Whatever the reason for a name change, it can make the process of learning about one’s ancestors difficult, if not impossible. In this episode, Gates unearths missing links in the family histories of media legend Barbara Walters and educational superstar Geoffrey Canada. Walters did not know her father’s real last name. Canada did not know the name of his grandfather. Both had been unable to access their history … until now.

What do Kevin Bacon and Kyra Sedgwick have in common? They are both famous actors and both descend from prominent American families that have been in this country since its inception. But they share something else, too: Both had ancestors who were early opponents of slavery. Bacon’s Quaker ancestors repudiated slavery long before the rest of the country, in 1780. And Sedgwick’s ancestor Theodore Sedgwick argued the freedom case of Elizabeth Freeman, also known as “Mumbet,” in 1781 — which helped bring an end to slavery in Massachusetts. These facts – and many others – are revealed to Sedgwick and Bacon in this episode, revealing quite a bit about slavery in the North in the process.

Pastor Rick Warren, Rabbi Angela Buchdahl and Sheik Yasir Qadhi — clerics of three different faiths — all have complex family histories that profoundly shaped their religious beliefs. Research of their roots unearthed a story about the spiritual foundations of this country, an unrelenting struggle to achieve the ideal of religious freedom and tolerance, but also the difficulties sometimes of holding onto one’s faith and still feeling like an “authentic” American.

Many Americans descend from a variety of European ethnicities, with ancestral roots across every country in Europe. Actors Robert Downey, Jr. and Maggie Gyllenhaal are textbook examples of Americans with a rich medley of European immigrant stories in their family trees. Delve into their deep American roots in early colonial communities and meet their Eastern European Jewish ancestors, who share almost identical migration stories. From the Mayflower to Ellis Island, journey through centuries of immigration that shaped and built this melting pot nation.