Nope. Race is a social construct as well.
No, it is not. Like sex, race is an observable, provable parameter of humanity, by which some humans differ observably from others. A Caucasian is observably different from a Negro, who is observably different from an Asian, and so on. This isn't a
“social construct”; it is a set of objective, observable differences. How we treat people, according to race, may be a social construct,but race itself is not.
I had previously been under the impression that the different races were subspecies of humanity, but it turns out that's not really correct.
“Race” is actually recognized as a valid taxon below subspecies; all extant humans are of the same subspecies, but we are of different races. Below species, the different taxa become somewhat fuzzy. Species is defined by the ability to freely interbreed. You only ever really get different subspecies, or races, or strains, or any other taxa that might exist below that, by having populations isolated from one another, prevented from interbreeding, long enough for these isolated populations to evolve in different directions. As modern travel technology is causing the world, in effect, to become smaller, and allowing the previously isolated populations to interbreed, the races are becoming less distinct, and eventually, may all merge into one homogeneous race descended from all the races that now exist.