I thought it was American states so I was confused until in a last ditch attempt I wrote Canada. Then I finally realized that it was countries in the Americas
One thing is appropiating the word America for your country, don't appropiate its adjective form too, please. Every country in "the Americas" is indeed an American country.
The demonym American has been used, by virtually everyone in the world, to refer exclusively to the United States of America for many decades if not centuries. If any appropriation is taking place here it would be mis-using it to refer to everything from the Americas, something that didn't catch on anywhere outside of a couple of Latin American countries until approximately 5 or 10 years ago. The way you are using the term is so peculiar and confusing - to everyone, not just Americans - that it almost has to be deliberate.
Just because a case of cultural appropiation is extended due to cultural influence doesn't make it right. And it's decades, not nearly centuries. Also, America was first and for a long time the name of the continent. It's United States of the continent of America, not the country of America (similar to the United Kingdom of Great Britain, the latter being the geographical location, not the country). US ignorance and nationalism doesn't make their delusions a reality.
It's not extended due to American cultural influence, Ferbin. The demonym was first used to refer to the United States of America by the British when referring to their colonies. The only way that cultural influence spread around this use of the term is because the English language has been spread around. And we're still speaking English. In English, American still is almost exclusively used to refer to people or things from the United States of America. There is nothing wrong about this. You are insisting on a change for ignorant, nationalistic, chauvinistic political reasons, not to be correct. It's no more wrong to call American things American than it is to call things from the United States of Mexico Mexican. As mentioned, virtually every person in the world understands the term to mean what I said it means, not just Americans. When everyone agrees that a word means something, that's what the word means. To claim otherwise is ignorant and wrong.
And if you're talking about France due to French Guiana, then only the pop of French Guiana should count (as it happens with Russia in this kind of continental-centric quizzes).
The description says that it is the most populated countries that are in the Americas - not the countries with the highest population in the Americas. Therefore France should be on the list.
But even though Turkey has territory in Europe, and so does Kazakhstan, they are both normally counted as Asian countries. Spain has territory in Africa, but it is still mostly European and it's counted as a European country. France is counted as European in the same way. The oddest one is probably Russia, which is usually considered European, even though the large bulk of its territory is in Asia. But there are reasons for that, too.