In each group, name any answer which matches the first category to reveal the second category, then name any answer which applies to both categories to reveal a third, and so on.
I tried Cuba for the first yellow box but it didn't work. I'm pretty sure Havana and Cuba don't start with the same letters, and I think Washington DC is longer than nine letters.
There is too much ambiguity around the term 'American' countries. I have never heard of Jamaica and T&T as 'American' countries. They are Caribbean and, at a push, in the Americas, but that is a different thing. Latin America is also considered South America in the conventional sense, so Dominican Republic is a head-scratcher (yes they speak a Latin language but the terminology around this quiz needs to be tightened).