Some countries have a noticeable "north/south" divide, in which the culture, accent/language and the wealth may be different. To compare, try and name the five biggest cities by population in both the northern and the southern bit of each selected country.
I've coloured in regions that don't fit in a "North/Soth" model in grey. The country I'm most unsure about is the US--using the Maxon-Dixon Line places Washington DC in the American South, which just doesn't feel right. However, any other definition I found was completely sentimental and objective, not good for an informative quiz.
For Providence, RI, I tried Hartford, Bridgeport, and New Haven. I thought it couldn't possibly be in Rhode Island. I gave up and what I saw? Providence!
Otherwise great quiz (◍•ᴗ•◍)❤