Yes, it's cool that North America observes it mostly, but look at Arizona, the state that everyone says doesn't follow DST, but look, there's a bit of blue in it, which proves that Arizona still follows DST, but only partially.
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Also, Hawaii is the only other state, but not the only American island, that doesn't follow DST.
Edit: I failed with the above sentence. Read it again.
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Yay, first "edit" that I've ever made.