Story of the Underground Railroad to Mexico gains attention

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In this Feb. 2, 2019, photo, provided by the University of Texas Rio Grande Valley, is the Eli Jackson Methodist Church and cemetery in San Juan, Texas. It is located on a ranch once operated by Nathaniel and Matilda Jackson, a biracial couple believed to have been "conductors" of the Underground Railroad to Mexico. Across Texas and parts of Louisiana, Alabama, and Arkansas, scholars and preservation advocates are working to piece together a puzzle of a largely forgotten piece of American history: a network that helped thousands of Black slaves escape to Mexico. (David Pike/University of Texas Rio Grande Valley via AP)