It's by the physical location of the university/campus. (If the offshoot campus is in another continent, it is counted there, but there are few published AI res

It's by the physical location of the university/campus. (If the offshoot campus is in another continent, it is counted there, but there are few published AI researchers in offshoot campuses so far that I've seen.) I certainly agree that the US strength in cutting edge research in many fields significantly derives from its recent immigrants. If the US becomes hostile to high-potential immigrants, its strength will decline.