Howard Walter Florey, Baron Florey, OM, FRS, FRCP was an Australian pharmacologist and pathologist who shared the Nobel Prize in Physiology or Medicine in 1945 with Sir Ernst Chain and Sir Alexander Fleming for his role in the development of penicillin. Wikipedia
I completely agree with your first sentence.
But.... if he was "born to Serbian parents", how can you say he is American?
I think the most accurate description would be:
Serb born in Austrian Empire that lived most of his life in United States.
Me being Dutch has nothing to do with that of course :)
Ugg Boots = just a type of boot
Samba and the Tango = just a kind of dance.
Ice hockey- it's just hockey, on ice.
Surely there are many more notable and interesting inventions which can replace these things in the quiz.