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I think it has something to do with like the royalty in england having zippers on their clothing first, in which a handmaid would obviously zip and un-zip the clothing, then the rest of the nobility got them the same way and by the time it had spread to the masses, they still had zippers on the left.
Now I'm guessing in America they were like screw the royalty, its all about the common man with no nobility, and when they made zippers they were like yea we should put it on the right because honestly I don't have a handmaid.
Of course this is just a guess, I have no clue.
Thats a decent guess. makes sense to me.