The opposite is being a non-Mexican.
Nationalities do not have antonyms.
You could say that you are being "opposite of how other people are" on Opposite Day. If you say the opposite of an opposite, it is a true expression.
A non-exhaustive list would be:Tijuana, opposite to San Diego, TXCiudad Juarez, opposite to El Paso, TXNuevo Laredo, opposite to Laredo, TXMatamoros, opposite to Brownsville, TX
Yes.
The opposite of being befuddled is being able to think clearly
The opposite of being alert could be being unprepared, unaware, or inattentive.
There really isn't an opposite to a taco. A taco is a Mexican food, and there are mostly never opposites to nouns. Though, you could say that the opposite of a taco could be a hot dog.
By being 18 years old and having Mexican citizenship (having one or both Mexican parents or being born on Mexican soil, including ships with Mexican flag on international waters).
Being unpopular.
Being superior
It is directly opposite to Presidio, Texas, on the Mexican side of the border.
The opposite is being left behind.
Being Mexican is your aanswer