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North American power outlets are topsy turvy - but does it matter?
(www.youtube.com)
Neat vids from youtube or wherever. Rules later
Technically speaking you're right. There is no true federal level law on electric code. But there is the NEC which is used by most states and most people would consider that the standard electrical code for the country even if that's not technically true.
The NEC does not have an article for outlet orientation. Some engineered jobs will spec it one way or another (eg. hospitals) but there's nothing in the code.
I think the video even mentioned that nec doesn't have an article on it.