If you Google it, it's part of "Mexico and Central America." I say it's fine where it is.
You can't always trust Google, the wikis and similar sources :x
And yes, I agree. The Mid & South Americas subforum should be called "Latin America". It's more proper, and also you'd include spanish-talking countries from the caribbean zone like Puerto Rico.
I'd also suggest a special forum for Brazil and portuguese speakers, but I don't know if the admins may agree.