Race As A Social Construct

http://www.vox.com/2014/10/10/6943461/race-social-construct-origins-census

I would add to this that America's long infatuation with race purity did give "race" a superficial scientific veneer.

As laws against miscegenation fell by the way side, the lines of race blurred.  We are certainly moving in a direction where "race" falls away and is replaced by more specific ethnicities.  Both are social constructs, but one ultimately is more definable.