Yes.
"Mexican" is a nationality-- a Mexican is a citizen of Mexico.
No.
no they do not the Mexican instead becomes an American citizen
For Mexico, its largest trading partner is the United States, being the recipient for 78% of total Mexican exports (2012).For Brazil, China is the largest trading partner, receiving 17% of total Brazilian exports (2012).
Yes
mexico trades with brazil
Ilegal Brazilian immigrants had come to the United States throughout the Mexican border when Mexico did not entail visa for Brazilian citizens.
No. Neither will automatically become citizen of the other country.
father borm in san francisco but the mother is an mexican citizen and baby born in mexico is the baby an american citizen
Your spouse has to sponsor you for immigration to Mexico.
Yes, you do.
Yes. You must be Mexican by birthright and have one or both parents of Mexican citizenship.