Alice L. Baumgartner is an assistant professor of history at the University of Southern California. She is the author of South to Freedom: Runaway Slaves to Mexico and the Road to the Civil War (Ba...view moreAlice L. Baumgartner is an assistant professor of history at the University of Southern California. She is the author of South to Freedom: Runaway Slaves to Mexico and the Road to the Civil War (Basic Books, 2020).view less