The "Hispanic" label is very misleading. The countries of Central and especially South America are very diverse. They had periods of massive immigration similar to the US.
My wife is from South America, we both come from Italian ancestry. My people came to the US, hers to South America. But she is considered a different race than me??? Crazy !!
I believe White men look overseas for women mainly because American women are not very feminine. Although White women tend to be more feminine than black Americans, hence Black men tend to look at white and Asian women.
I tell my children that marriage is hard enough on its own, throw in race/cultural differences makes it that much tougher. With that being said, I wouldn't be against my children marring outside their race along as the person they are marrying is a practicing, faithful Catholic.