Is Race a Social Construct?? Why???

There is one race the human race some say......Do u think that people have racial dividers so they can differintiate themselves as superior or inferior beings....Why do u think that is...Race can be used to decribe a person geographical orgins....
Update: WAKE UP: Perhaps your answer would be better had it actually been for the question I asked. The question was not "is race an evolutionary construct" but if it is a "social" construct. There is a difference.
Update 2: Additionally, what you will find, if you ever try research is that there is more genetic difference within races than there is between races.
Update 3: And yes i am familiar with Johann Blumenbach classification system and his racial scale but we are not talking about physical or biological aspects of race the social aspects of it...just to be clear..
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