A Mexican-American.
I am guessing it is a Mexican descent that is a citizen or resident of Jamaica
YES
I am of Mexican descent myself. My mother is a Mexican citizen, my father was American, also of Mexican descent. "Of Mexican descent" or "Mexican" is just fine with me. Generalizations like Hispanic and Latino are not preferred by us unless our nationality is not known. It is however bad form to refer to a Hispanic person as a Mexican if they are not. Guatemalans, Puerto Ricans , Cubans, etc. have their national pride too.
A white Mexican is a Mexican citizen who is predominantly of European descent and both his parents do not necessarily have to be white.
No, you are Mexican.
No. Neither will automatically become citizen of the other country.
Definitley not
no
no
Yes, you apply at the nearest Mexican consulate.
The largest Latino group in the US are individuals of Mexican descent, followed by Puerto Ricans and people of Cuban descent.
That is called bigamy!