Noah had three sons Shem Ham and Japheth
Dark skinned peoples are believed to be descendants of Ham.
Genesis 10:1 Now these are the generations of the sons of Noah, Shem, Ham, and Japheth: and unto them were sons born after the flood.
Genesis 10 describes 70 nations descended from Noah who populated the earth after the confusion of languages
Go here for a table of nations
I hope you find this helpful.