1) "Mainland" is often interpreted as including Alaska.
2) In the Great Lakes area, coastline and border don't agree. That is, state borders extend into the lakes in such a way that Wisconsin, Illinois, and Indiana do not border Canada.
Wow... I spend so much time learning global geography that I let my national geography slip! I'm American, but I found this quiz significantly harder than the Afro-Eurasian Coastline quiz.
This would be a lot better if you didn't have the yellow bar. Instead of randomly guessing, you have to do them in order of the way the creator listed them, which is seemingly random. This would be way more enjoyable if there wasn't a bar.
1) "Mainland" is often interpreted as including Alaska.
2) In the Great Lakes area, coastline and border don't agree. That is, state borders extend into the lakes in such a way that Wisconsin, Illinois, and Indiana do not border Canada.