Protesters hold signs in front of the statue of Confederate General Robert E. Lee on Monument Avenue in Richmond, Va., Saturday, Sept. 16, 2017. The group of Confederate demonstrators were escorted out by police after a 50 minute protest.

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Protesters hold signs in front of the statue of Confederate General Robert E. Lee on Monument Avenue in Richmond, Va., Saturday, Sept. 16, 2017. The group of Confederate demonstrators were escorted out by police after a 50 minute protest. / The Associated Press

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.