EDINBURG — The Museum of South Texas History will host a Sunday Speaker Series Online presentation, “Incarcerating Mexican Immigrants in South Texas, 1929-1930,” with Cristina Salinas, who holds a doctorate in U.S. history, at 2 p.m. July 26 on Facebook Live. In March 1929 a new reality went into effect at the U.S.-Mexico border. A new law created criminal fines and penalties for undocumented migration, thus making a crime what had previously been solely an administrative violation, punishable by deportation. Now, crossing the border at unauthorized ports of entry could be punished by jail time, as well as deportations. Immediately afterward,