This is a year-plus old, but worth a look. It's photos from a National Geographic article looking at "the face of America" in 2050. Based on demographic trends in marriage, a large number of those faces are of mixed race / ethnicity.
I suspect there are a lot of people not terribly thrilled about that. But, honestly, I think it's a good thing. Looking around the globe, nations with a high degree of ethnic / racial separation don't do well in the long term. E pluribus unum is a pretty good motto to have.
National Geographic Predicted What Americans Will Look Like In 2050