Nice test, although I don't quite agree with the definition of "native language" as used here. I think it's incorrect to say that Spanish or Portuguese are "native languages" of Argentina or Brazil (although they are indeed the native languages of most of the population).
I'd recommend changing them to actually native languages. That'll also help to make this part of the quiz a little harder (as it stands now they most of the South American countries are obvious giveaways)
Some suggestions: Paraguái (Paraguay in guaraní), Bulibiya (Bolivia in quechua), Piruw (Peru in quechua), Sranan (Surinamese), and Ayiti (Haiti in Haitian Creole).
I'd recommend changing them to actually native languages. That'll also help to make this part of the quiz a little harder (as it stands now they most of the South American countries are obvious giveaways)
Some suggestions: Paraguái (Paraguay in guaraní), Bulibiya (Bolivia in quechua), Piruw (Peru in quechua), Sranan (Surinamese), and Ayiti (Haiti in Haitian Creole).