Stephen Miller is ignorant

[haele]

2. America had wealthy businessmen who were willing to pay immigrant scientists and engineers

To work on projects they couldn't find enough Americans with the education and background to work on.
The US also had the wide-open space, an industrial and manufacturing infrastructure that had more resources and capability to build at scale to support larger experimentation. Also, there might not have had all the science and engineering ability, but there was a surplus of strong backs and willing enough hands available to support those scientists, engineers, and technocrats without the class expectations that limited more participation in the rest of the world.

Tesla and Einstein were original H1Bs.

Miller and his ilk are idiots.