Mexico is technically close to El Salvador, but next time you run into a Mexican ( a real Mexican, enter "PAISA", if it suits you ), ask him if he's from El Salvador. You'll get gutted for that here, my friend.
It's a different...life. People get upset about people (like me) not wanting to be labeled as a ''latino'' or ''hispanic''...and it's because of this. I'm not a Brazilian. I'm not Cuban. Definately not Puerto Rican. So, no...I'm not "LATINO", meaning the ''same as'' them.
But, yeah...El Salvador does NOT automatically = Mexican.