LINK or SOURCE, anything besides your personal opinion?<quoted text>
Hispanics, blacks, etc. put their heritage first because there are people like you whom they very well understand will never ever accept them--regardless of how successful they become--and as a result, do not want to assimilate entirely. They also recognize that they have a heritage and culture worth preserving. What folks like you are saying by asking them to assimilate is that their heritage and culture and language are not worth preserving.
The cause of their desire to not assimilate is the attitude of people like you. This is compounded by your failure to realize what the meaning of your desire for them to assimilate means.
You just don't get it and it's recognized that you have no plans to do so.