'Three Flags Day' celebrates St Louis's ties to Spain, France, and the Louisiana Purchase

Peter Kastor, Professor of History and American Culture Studies at Wash U, joins Chris & Amy in-studio and explains why March 9th and 10th are known as 'Three Flags Day'.The land known as 'Upper Louisiana' was transferred from Spain to France to the US over the course of those two days in 1804. In the second half of the interview, they discuss the evolution of political discourse between candidates. (Photo by Dilip Vishwanat/Getty Images)