First of all I don't believe that race is a social construct, but a construct of biology - which doesn't mean that I gradate races and consider some of them as inferior to others. But it doesn't really matter if race is a construct of biology or of something else - in both cases it is realistic, just like other man-made concepts (law, money, etc.). What I mean is that it should not matter what color of skin or what race is the ruling elite, but only how oppressive it is.
Biological classification of animals and in general all living things is also a construct of man-made science of biology.
Extended family is arguably a social construct.
Actually extended family is relatively less important in modern societies compared to its much greater importance in prehistory and early history.
Extended family is something which has been important for us humans already in our very remote past, when we all lived as hunter gatherers.
And we all lived as hunter gatherers during most of our existence as a species. Some 95% of our time on this planet we all - regardless of race and continent of origin - spent as hunters or gatherers. This fact is important to bear in mind when you consider why some societies did not advance as much as others. The simple truth is that we all did not advance that much during 95% of our existence. Only the most recent 5% was revolutionary for some groups of humanity.
So if anything, not advancing is a more typical condition for our species than advancing. Australia was the
norm, not China or Mesopotamia.
Hint: Government is a social construct. Money is a social construct. Debt is a social construct. Business is a social construct. Fashion is a social construct. Extended family is arguably a social construct. Power is a social construct.
But what I mean is that it should not matter what skin color or race is your government as long as it is competent.
Rhodesian regime was very far from being perfect but current regime in Zimbabwe is even more oppressive.