Why aren’t we all the same colour and have the same facial features?
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Different skin colors have different advantages in different environments. Closer to thr equator, the slight sun protection offered by darker skin is beneficial, so it was selected for over thousands of years. Further from the equator, people with lighter skin were better able to get adequate vitamin D from sun exposure, so that was selected for.
Some traits evolved like that. Some would be due to chance- isolate a bunch of populations and each of those populations would have a slightly different genetic makeup, so some traits would become much more common. Add to that random mutations that occur in one population or another that then stick around, etc, and you’ve got a wide variety of traits present in different regions.
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