If that's the case (which clearly it is), then limiting immigration is a bad move. Historically, the most powerful nations have been those with a free-wheeling

If that's the case (which clearly it is), then limiting immigration is a bad move. Historically, the most powerful nations have been those with a free-wheeling economy and open/liberal attitudes. The U.S. needs to continue to attract the world's bright, ambitious, and hard-working people. Now, I don't think the U.S. can afford to provide much of a safety net, in regards to basic income and healthcare if it's going to have open borders and a great deal of economic freedom. It will be expensive enough just to deal with the enviornmental problems of a dynamic economy.