While President Donald Trump continues to hammer the U.S.-Mexico border and illegal immigration, a recent study by the Federal Reserve Bank of Dallas said immigrants, especially those from Mexico and Central America, power the vast Texas economy. Trump said Monday morning that he hopes Mexico "will stop people from coming through their country and into ours, at least until Congress changes our immigration laws!" Those Central Americans Trump referred to make up 8 percent of the state's foreign-born population, the study said.