The Southern Poverty Law Center says there were two major spikes in the twentieth century for when Confederate memorials and symbols were dedicated: during the Jim Crow era and the Civil Rights Movement. Elizabeth Herbin-Triant teaches the history of the Jim Crow era at the University of Massachusetts Lowell. She and Andra Gillespie , an Emory University professor, explain why it is important to understand not just WHAT these monuments stand for, but also WHEN they were created.