The US does have a higher per-capita gdp (probably; the numbers are subject to a lot of interpretation) but that is in no small part due to the fact that the re

The US does have a higher per-capita gdp (probably; the numbers are subject to a lot of interpretation) but that is in no small part due to the fact that the rest of the industrialized word was mostly leveled in WWII. As of recently, I believe West Europe's gdp growth numbers are comparable to or exceed those of the US. But again, the devil is in the details in these things. As for birth rates, well... that's a pretty wild speculation. Demographers have a decent handle, as far as I know, on the causes of low birth rates. Do note that America has a declining population ex immigration, and that the birth rate for white people is below replacement rate and has been for 30 years.