Our invaders are dead weight.
The people of the middle east like dead weight.
The people of south America like dead weight
The people of central Asia like dead weight
The people of India like dead weight.
The future belongs to the most homogenous polities with the smallest underclasses for the simple reason that demand for services outstrips comparative advantage in productivity.
Ergo, via-negativa, the future belongs once again to the best gene pool, because that pool has the lowest drag. And our current condition nothing but malthusian expansion to the point of consuming all the gains from the harvesting of petrochemicals.