Why are there so many races?

Please tell me Religious followers of why there are so many races if we came from Adam and Eve? Noah?

And the fact that the races are different on each continent explains evolution 100%!
Update: To the tower of babel answer: Are you telling me that God changed the genetic makeup of the people that were already created?

And to the other person; If we all came from Noah wouldnt we all be the same? There is a reason why everyone evolved the way they did from wherever they are in the world.
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