my best guess is, you could've connected from a different ip once 10 years ago and it improperly geolocated that ip as being in a tiny country and now it thinks you're secretly from that country even though you've been accessing the site from a US ip forever. it's the only plausible reason i can really think of. unless they set up a "country estimation" ai or a similar newfangled system and it's convinced for some reason you're actually not american. it's too out there but you never know

Some GEOIP databases are rotting, near as I can tell.

I’ve got a proxy on random machine in a OVH DC in Oregon. Always properly geo-located to Oregon - until a few months ago.

Now YouTube insists I’m in France. Which is quite entertaining, ads wise.