In software San Francisco is still the top for AI research: even when Peter Steinberger didn't know what he will do with OpenClaw, it was clear to him that the only place to move to was USA.
Terrence Tao was a good example of what happens when an exceptionally smart person stops getting funded by an American University: not moving to another country, but got VC money and created a new company.
USA politics is looked at so closely, because it matters and changes and still more democratic than most countries in the world even though democracy is a mess (as it's supposed to be).