EDINBURG — The Museum of South Texas History welcomes Martin Salinas to present “La inmigración indígena en el bajo río Bravo o Grande,” a Sunday Speaker Series Online bilingual presentation, at 2 p.m. Dec. 5 on Facebook Live.The presentation will cover the immigration patterns of the indigenous groups in the Rio Grande Delta. Due to different reasons, members of multiple ethnic groups of the continent immigrated to the lower part of the Rio Grande or Bravo during the second part of the 18th and 19th centuries, among which are Pames, Huastecos, Tlaxcaltecas, Tonkawas, Karankawas, Cherokees and, especially, the Comanches and ...