Not a yank, but according to my research historically some states (and even some cities) had dissimilar voltages, amperages, and plugs, and even a choice of alternating vs nonalternating current. Sort of like how the poms have 100V instead of our 240V but with only a few kilometres of distance involved, dependant on power company.
Yep, yanks tend to think they can just police everyone into doing it their way.