Sure we do. They just become naturalized Americans if we can get our hooks into them, and honorary Americans if we can't. America loves being the sewer for everyone else's brain drains.
Just look at great Americans like Nikola Tesla, Albert Einstein, Werner von Braun, Leo Szilard, Alexander Graham Bell, William J. Kroll, Alexey Pajitnov, Igor Sikorsky, etc.
Just look at great Americans like Nikola Tesla, Albert Einstein, Werner von Braun, Leo Szilard, Alexander Graham Bell, William J. Kroll, Alexey Pajitnov, Igor Sikorsky, etc.