There is no free for all immigration. It would be fine if there was. There would probably be a huge rush of people from South and Central America at first, but

There is no free for all immigration. It would be fine if there was. There would probably be a huge rush of people from South and Central America at first, but it isn't like every person everywhere is eager to give up their life to move thousands of miles to a different country. And then immigrants don't depress the economy (they fill jobs but also bring demand that creates more jobs...).