But if i'm flying into Germany, for
example, would I be speaking to their ATC in german or english? What
about Mexico? What if i'm a mexican pilot would it be english or
spanish?

I believe it is in English, worldwide. I've never flown in a foreign
country, but my understanding is that ATC is supposed to be in English,
even for the natives.

Jose
--
Humans are pack animals. Above all things, they have a deep need to
follow something, be it a leader, a creed, or a mob. Whosoever fully
understands this holds the world in his hands.
for Email, make the obvious change in the address.