The "Yukon" river is associated more with Canada than the US. Yes, part of it lies in Alaska; nevertheless I would bet that not many would associate it with the US.
I really love your quizzes but there just isn"t enough time allocated for such a lengthy quiz. You should revise it and allot more time. Look at all the zero percent answers it is not BC people don't know them. I have to take your quizzes untimed BC I am not travelling with a laptop.