The article is not talking about the children of legal immigrants. Rather, the voters “transforming” Texas are the children of illegals, who are United States citizens because of “birthright citizenship,” a misinterpretation of language in the 14th Amendment (“All persons born or naturalized in the United States and subject to the jurisdiction thereof, are citizens of the United States and of the State wherein they reside”) intended to give citizenship to the newly freed slaves.
THIS is why the Democrats are so obsessed with preventing Trump from securing the Southern border. They see illegal immigration as their ticket to permanent political power.