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.
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.
Yay, first "edit" that I've ever made.