What's the real history of Thanksgiving?

Only on the "CBS This Morning" podcast, historian Kenneth C. Davis, the best selling author of "Don't Know Much About History" joins Reena Ninan to discuss the history of Thanksgiving that often goes untaught in school. Davis shares details on the first Thanksgiving between pilgrims and Native Americans — including what food was served and the violence that happened after the three-day feast — and dispels some common myths. Plus, Davis explains why Thanksgiving Day was a partisan issue in 1939 and how football became such a big part of the day.