Who associates Yellowstone with Montana? Honestly?
Anyone who's ever entered Yellowstone from the North, which is probably the majority of visitors. IIRC, there is no sign inside the park that says you are entering Wyoming, so if you are one of the pitifully stunted people who don't read maps, you might not know the whole park isn't in Montana, and if you do read maps, you will see that part of it is.
Also, Montana also has Glacier National Park, which I haven't been to, but I have heard really amazing things about.
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