A country that has a population where the vast majority of people are white the non white non people will have less political power and if the majority of white people are not restrained there is a strong probability that theytwill enact policies that benefit their race over minorities.
The only way this tendemcy can be avoided is to have all of the people respect the lives, liberty and property of eveyrone regardless of their skin color..
If 80% of the people in a country have black skin it is likely that the white skinned minority would exploited by the black skinned majority.
In a multi-racial society there should only be a human race where the color of one's skin is irrelevant.