America Latina in general is oriented towards the culture they share with each other, which origniated in Spain, like it or not.
Here's a nice example:
http://www.youtube.com/watch?v=SiQJGogjCoo
Last names, language and many customs (cockfighting, quince), are Spanish. So it is logical to support a Spanish team.
Almost all of the old capitaneria's have also infused some local flavor (African, Indian) in its culture.
About the use of Eurocup - sure you are a Dominican that is well versed in soccer - not I think, that makes the rest of your post hogwash as well.
About the shades of color, I'm sure the many Haitian soldier/Spanish settler couples were all voluntary. This is were most of the coloring of the population comes from. Until then, the population was, especially inland, 95% white.
So when do we start the talk of reparations on that subject, or did they forgot that part in 'black history month'?