eastern on the civil war, william marple, author of the book, lincoln's mercenaries, explains the economic factors that drove northerners to volunteer. at 8:00, san diego state university professor on the militaryar from the escalation in 1965 to the fall of saigon 10 years later. at 11:00 a.m., military historian and his book, the unknown and the untold story of the unknown soldier and the most decorated heroes who brought him home. real30 p.m. eastern on america, as part of our alaskan 1930 six film, silver millions, the 1949 film, eskimo hunters and western alaska, the 1967 film, alaska centennial and the film a left got highway. watch american history tv this weekend on c-span3. >>