I think the point is, as shown in quite a bunch historical examples, being a state of two nations is hardly the worst instability threat possible. The severity of a problem depends on what those two nations may be, how their cultures interact, and on top of that, it can always be more than two, exponentially complicating the politics of the situation with the number and differences between the nations involved.
It's also worth noting that i find the concept of "Hispanic American nation" quite interesting in its background...
I think it's an artificial creation, one made by certain factions of America's own political forces, for their own purposes. After all, there is no "Hispanic nation" in the homelands of said nation, quite an oddity compared to ordinary nations. There, there are Guatemalans, Hondurans, Mexicans, Ecuadorians etc. They only become a different nation once in USA, and it wouldn't necessarily have to be a different nation than plain "American".