Except the at height of American wealth and power (1940s-1970s), immigration was very low. And in a period of great decline (1980s-2010s), immigration has been very high.
It's nice you think that the third-world will prevail over the US. Just reinforces that third-worlders don't really have the US's interest at heart. At best, the US is a place where they can beat lazy Americans at the rat-race and show how much better they are because their parents forced them to study calculus during the summer.
Seriously you think immigration have immediate impact to a country? A country and economy takes decades to build. Without the large infusion of immigrants in the early 1900's, there wouldn't be the earlier industrial/manufacturing boom in the US. US probably won't even have the man power and manufacturing power to fight ww2 in European and Pacific theater. Without those, you think the US would have the 40~80's wealth and power?
I am the ones keep offering solutions here to NOT let the third world prevail over the US. Solution like getting high skilled workers to the US to improve US business efficiency and profit. Getting government to have a strategy and plan to compete with rest of the world on high tech, high skill companies and jobs. So far I only have heard you say how great the US was back then, but not a single word on how can the US be great now, other than closing your doors and expect China and India to go away.
