Well , i don't know if this "caucasoid " thing is as old as you would like to believe my friend.
The Human haplogroup clasification clearly shows Caucasoid is the default.
The other races are a mixture with whatever is left of the pre-N mtDNA (L clades) + that haplogroup M.
On the male side needs special mention the haplogroup E, that as oppose to F seems to have mixed with the previous haplogroups.
These different ancestral components are what 'races' are made of.