> Only

Nope. Never in my life heard of it being a britishism.

Edit: A downvote for proving an absolute statement wrong?

"Bloody" is used as a britishism. "Wee" is not, at least in many areas.

Not in the urine sense, but as in "a wee problem" it's got strong British (mostly Scots, really) overtones for me.

Yes, I've seen that use.

When people use it, they probably won’t add “that was a britishism I just used”. You interpret that through... eh, cultural analysis.

Have lived all over the US, "wee" is most definitely used.

As a Britishism? I didn't say it wasn't used at all.

I guess, if you squint just right -- but only in the same sense that it's true of most American English.

Those uses of "wee" (particularly the "urine" meaning) have been common in the US for far longer than I've been alive. Nobody thinks of them as "britishisms".