"Born in Canada, Naismith studied physical education in Montreal before moving to the United States, where he developed basketball in late 1891 while teaching at the International YMCA Training School (now Springfield College) in Springfield, Massachusetts."
population in check" - I tried Prozac, Zoloft, anti-depressants... might have gone on to guess anti-psychotics, television, the "American Dream" and Fox News... but then I figured out you meant the size of the population not the existing population.
Because somebody MOVES to America and invents something doesn't mean they're American except on paper.
I guess you can argue that Michael J. Fox, Mike Myers, Jim Carrey, Tommy Chong, etc. are American because Hollywood is a pretty big circuit and countries love to claim the positive culture from elsewhere as its own, but do you ever think "Oh Einstein ? TOTALLY American.Tesla too!" Probably not, but you should by the same logic as famous entertainers.
I guess I'm just rambling.
I don't know.
There should almost be a rule like if you have lived in a country for the first 15 years of your life (give or take), then you are (considered) from that country,
One of Canada's biggest exports is comedians for sure.
edit: and I am pretty sure you are not the only one, I think a lot of people probably thought of gramophone and tried that one, not knowing about phonograph, since it is only at about 40%. If it was a question where the answer was gramophone I would have expected it to be at about 80%