Race and Human Variation

Why do we classify people according to race? Is this due to biological differences, social differences, cultural differences or a combination of factors? Provide support from Week Two learning resources for your view.
References:
Position of America Physical Anthropological Association on race (1996):
http://physanth.org/about/position-statements/biological-aspects-race/
Two Questions about Race (2006): http://raceandgenomics.ssrc.org/Goodman/