While early humans’ migration led to changes in our skin tones, what affected the distinctive face characteristics of each race?
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Over time, random changes happen in the DNA of any organism. These mutations can lead to different traits and they are passed to the children of the organism.
Evolutionary pressure is when one trait keeps the person alive better so they have a better chance to have children and pass on the trait.
Not all changes in facial features are because of evolutionary pressure. Some random changes just happen. Because the populations of different races were separated, the random changes that accumulated in each area would be different.
Also, perhaps, there came to be styles as there are styles in clothing or architecture. When people choose mates to have children with, perhaps they favored certain facial features over others. But this would not be necessary to explain variation between geographically separated groups.
The OP’s question comes from a faulty understanding of evolution. Not every trait is “because” that trait will “help” There’s no design and no designer. As long as the trait doesn’t cause harm, it doesn’t have to have a purpose.
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