These are states, countries, territories, provinces that are named after another state, country, territory, or province, beginning with the word "New".
According to https://www.thoughtco.com/new-and-old-countries-1435001
That was my initial thought too, but the instructions are clear that the quiz is only about places named after other places. There is no place called "foundland" so therefore "Newfoundland" doesn't qualify!
What the instructions are not clear about is that the quiz includes nicknames/historical names for places that are now called differently. Also there is no country called New Guinea and Papua New Guinea doesn't start with New.