If you take 4 islands and you populate the first one with whites, the second one with asians, the third one with blacks and the fourth one with arabs and then leave and come back after 20 years, you will find the following situation:
whites: well developed civilization, strong military, trade with asians.
asians: well developed civilization, lots of shops and businesses, trade with whites.
blacks: lots of huts made from palmtrees.
arabs: extinct due to excessive internal wafare.