Thus, not only are physical causes inadequate to produce results analogous to those which occur in North America, but they are unable to raise the population of South America above the level of European States, where they act in a contrary direction.
Honela, kausa fisikoek ezin dute inola ere hegoaldeko eta iparraldeko amerikarren artean antzerako emaitzarik sortu, baina gainera derrigorrez sortu behar lehenengoen artean Europan ikusten dena baino zerbait kaskarragoa, hemen kontrako zentzuan jarduten dutelarik kausa horiek.