The smartest people in the world flee fascism and totalitarianism.
The USA got the bomb because the smartest physicists fled national Germany and Italy and anywhere under its occupation. There was a mild shift where more peer reviewed pubs started to show from Europe and elsewhere in trumps first term.
It is accelerating now and Canada, Australia, Europe are actively poaching the best minds out of the USA.
This was why Soviet and Chinese science sucked under the commies, where political loyalty and tests and censorship were applied everywhere. No decent scientist can do great things under those conditions.
Again, this administration is unilaterally destroying every advantage America has on its chief adversaries.