Pass the popcorn. That is exactly what diversity brings. Afro-American, Latin-American and Asian-American! There is NO MELTING pot any more because each “group” thinks it’s group is more important than anyone elses and refuses to assimilate (melt) into being US citizens.
If we were a melting pot, there would be no black or Asian people in the US. Even "white" ethnic groups took three generations to start intermarrying with others.
Even if one looks at Brazil, where there are alot of racially mixed people who don't consider themselves black or white, there are still divisions. Most of the racially mixed folk are descended from folks who mixed along time ago. White folks don't usually marry dark skinned mulattos, who don't usually marry blacks down there.
However, a key difference between the English speaking world and the Spanish/Portuguese/French speaking world is that in the former, if you had any degree of black blood, you were considered "black", in the latter, you were considered "near white."