America's population could plunge as much as 32% if the US were to completely close its borders, one Brookings projection found.

President-elect Donald Trump's hardline immigration proposals -- including a controversial mass deportation plan -- could prove economically damaging, analysts say, with US sectors that rely heavily o

Trump will not succeed in limiting immigration as much as he promises – says Wojciech Kopczuk, a professor of economics at Columbia University. – The U.S. faces the same problem as Europe: low birth rates.