You actually didn’t address the theory. The claim was about welcoming “promising minds”. Presumably that means top acientists, engineers, etc The current systm

You actually didn’t address the theory. The claim was about welcoming “promising minds”. Presumably that means top acientists, engineers, etc The current systme in America is renowned for being very difficult to get in to on a merit basis. Was this different in the 1950s? Perhaps. Also note thatbwhen considering america in the 1950’s, you’d need to look at immigration levels in prior decades. There’s a lag time for kids to grow up. I don’t know if the theory is right or not. And you,ve certainly provided some data to show it *mayg be wrong. But it’s far from conclusive.