If Eugenics do not matter, as most politicians and ivory tower academics would have you believe, why are the countries that historically employed Eugenic policies (Germany, Canada, Australia, etc.) so much better off than countries where Eugenic policies were never in place (Mexico, Brazil, the Caribbean, etc.)?
Could it be that centuries of smart, scientific breeding, as opposed to the wanton race-mixing festivals of the lower latitudes, gave certain European and North Asian peoples genetic advantages that aided in the spreading of their respective civilizations?
Look at how rich the non race-mixing Anglosphere is. Canada, New Zealand, Australia, and America were all very proactive in promoting white immigration while at the same time banning all miscegenation.
Now, compare this to the Hispanosphere: Mexico, Brazil, Guatemala, Nicaragua, El Salvador, Dominican Republic, Bolivia, Peru, etc.
Ah, the good old days...