because of the treaty of tordesillas. brazil gave mexico everything east of the douro river.

Probably some weird historical reason. Would indeed be more logical if they spoke Brazilian.

You see, Iberia was once controlled by a Muslim dynasty. Then the east portuguese faked being nice to them in order to get them to drop their guard. This was so effective, they did it multiple times. Darling/dear in east portuguese is “Quista”, so that’s why it’s called the re-con-quista.

As for why they called their dialect Mexican? Because they were big fans of the moon, of course.

Mexican with a lisp

The cocaine?

Mexican but snooty