Hispanics (possibly Puerto Rico)
As the same species, it has been possible for all of these humans to reproduce and create a new breed of humans. Even with different physical attributes, they have lots in common, therefore keeping most of the same traits. With skin color, height, and other physical distributions as factors, the mixing of these humans have made the very diverse world that we live in.
It's not easy to predict the way humans will look 1,000 years from now, but what we do know is that blonde hair and light eyes will be the first attributes to go. With the wide spread of Asians and Hispanics, the probability of the majority of humans looking like that is extremely high.