Mass immigration, both illegal and legal, is dramatically “reshaping the American South” more than any other region of the United States, research from the Center for Immigration Studies shows. The analysis, conducted by Steven Camarota, looks at the expansive growth of the nation’s foreign-born population, which has reached an unprecedented 51.6 million — the largest ever in American history. “Immigration policy is reshaping the American South more than any other part of the country,” Camarota writes.