"US and Mexico Wall" HISTORY: When Mexico proclaimed independence from Spain in 1821, California, Texas and the land in between were part of the country's territory. But white Americans who had migrated to Mexico turned and seceded from the nation in 1836. They founded the independent, short-lived Republic of Texas, but were later annexed by the Americans (Little, 2018). With the land from Texas ' annexation and the cession of Mexican land given under the Guadalupe Hidalgo Treaty that ended the Mexican-American War, the U.S. acquired about one-third of its present territory. The 1853 Gadsden Purchase would finalize the frontier with Mexico (‘How the Border Between the United States and Mexico Was Established’, Wallenfeldt) IMPACT: Building a wall is about keeping people out. Yet, there is much more danger than this reason could ever hold. The geographical range of indigenous animals and plants, including species listed as critically endangered, will be bis...