Henry Louis Gates Jr. talks about artifacts like the afro comb found near the Nile Valley from early African civilizations.

A biography on Civil Rights icon Cesar Chavez, from his humble beginnings to leading his farmworkers union in huge strikes to protest mistreatment.

John Green explains the end of the Civil War, why the North won and Lincoln's assassination.

John Green explains the beginnings of the Civil War, what caused it and why the North had such an advantage.

Henry Louis Gates Jr. talks about evidence of ironworking beginning in Africa as early as 1500 - 1800BC and how it may have originated in Africa all together.