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)In this Sept. 27, 2017 photo, Freedmen's Town Preservation Coalition president Dorris Ellis Robinson, right, and Catherine Roberts, left, look over a model of Freedmen's Town, an area built by emancipated slaves after the Civil War, in Houston. The area is believed to have been connected to 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. (AP Photo/ Russell Contreras)In this Feb. 2, 2019, photo, provided by the University of Texas Rio Grande Valley, is the cemetery by the Eli Jackson Methodist Church 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)In this Sept. 27, 2017 photo are the cobblestone streets of Freedmen's Town, an area built by emancipated slaves after the Civil War in Houston. The area is believed to have been connected to 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. (AP Photo/ Russell Contreras)In this Feb. 2, 2019, photo, provided by the University of Texas Rio Grande Valley, is a marker for the Eli Jackson 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)
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)
