[quote poster=ツ; 39999; 767763]He said he can apply for his cit, but because his wife is a cit of here, and he is still a cit of mexico, they want that fall back plan. Funny when he brings up the election and I bring up how he can't vote. Pisses him off. [/quote]

Both the US and Mexico allow dual citizenship.

Edit: I think I remember reading an article where the Mexican government was encouraging their citizens that are in the US legacy to naturalize, so they can vote in US elections and influence policy.