Sallow
The Big Bad Wolf.
It's a normal part of the human evolutionary process.
Yep but we are at least hundreds of years away from being ready for a world government.
Easily several hundred years.
First thing that has to happen is all the individual races be bred out of existence to eventually produce a single version of human.
That's probably not going to happen. Even within our "races" there are differences.
What's going to need to happen is that people believe those differences don't really matter much.