The Japanese and Korean kids study much harder. Their PISA scores and number of hours worked show that.

GDP may be arbitrary, but here is a fact. Between one third to half of silicon valley companies (the industry where the US has the highest dominance) are started by Asians. Now Asians form about 3 percent of the US population, so you can see the dynamism they have brought to the industry.

Ironically, the largest competition to the US comes from China. Chinese e-commerce companies are as large or larger than the American ones. Stopping Asian immigration will only increase that gap.

Let' not forget, China and India were the world's largest economies from 1000 B.C. to 1850 A.D. What we are witnessing is a restoration of the normal order, which had to been destroyed by  colonialism.