That's more or less what I already believe -- that is I already agree with the statement "race is primarily a social construct". Of course some sub-populations

That's more or less what I already believe -- that is I already agree with the statement "race is primarily a social construct". Of course some sub-populations have different genetic factors which may have some handwavey amount of effects, but I'd argue that 1) having multiple distinct "races" is primarily caused by group dynamics among humans rather than genetic variation, and 2) these constructs are generally harmful and we'd be better off not having them.