What is the evolutionary advantage of different heights with respect to different races?

So from tallest to shortest :

Black people > white people > south asian > east asian

huh. i never really saw very tall black people. you are just a stupid racist.

http://en.wikipedia.org/wiki/Foster%27s_rule

>>2
it's racist merely to suggest physical differences exist between different ethnicities?

>>3
It's racist to question the motivations of anyone who accuses you of being a racist.

You racist, you.