I'm not from the US, maybe that's why I don't deal much with the names people give to "races". The only case particularly relevant to me is that of a certain megalomaniac getting people riled up about the "Aryan" race which I'm sure we both agree was also quite nonsensical.

English --> Caucasian Balkan -- > not Caucasian, not close enough.

I mean, if we're going by geography, Balkan would be closer to the Caucasus than either of them to England. I couldn't tell you how any given ethnic people moved, spread and intermingled over the centuries, but as you say, it's not really relevant outside the US.

I just consider very funny that the people from the region that gives name to the Caucasian "race" are not considered white enough to be considered Caucasian.

That's partially why I avoid the use of that term. The rest of it is that it just isn't a useful term since it...

And it's very stupid because I'm Spanish but I couldn't tag myself as latin, they say I must use Caucasian.

...is so broadly used that it no longer refers to any distinct ethnic, geographic or cultural group. It's just a shorthand for the stereotypes and biases people attach to it.

Of course, the whole point of sorting people into races is racism, but we knew that already.

Granted, I was being imprecise, but my point was that many UK and US shows and movies scarcely cast actors from the Mediterranean or the various other former Roman provinces that would also have wealthy elites who would have to be involved in public matters as any other Roman citizen was expected to. Because that's what most influences whether you'll make it high in the Cursus Honorum: having the money to make friends.

Instead, they primarily cast "makes milk look tan" Brits, particularly for their elites. When the Senate of a Mediterranean Empire looks like they only ever hold public speeches or leave the house for any other social function when it's overcast, that does irritate me.