Not necessarily. Many of the technological revolution started with refugees and immigrants before, during and after ww2. And technically you should even count the NZ that were brought to create the rocket programs

Anyway, I feel that you need read this guy comment

https://news.ycombinator.com/threads?id=pj_mukh

I appreciate the information. However, labor Arbitrage affects millions of American workers. It probably affects tens of millions. I just cannot fathom that companies today have any positive ethical reasons for wanting to participate. It gives them another stick to use against both groups of workers. Also, H-1B was started in 1990, so well after World War II.