Peter Zeihans insistance on birth rate is a bit silly. Most developed countries, including the USA are in the 1.5-1.7 range. There are outliers like France that are higher. There isn't this huge demographic difference between Europe and the US. He is selling his message to American conservatives, so I guess the one who pays the piper calls the tune. I don't think he cares about immigration much.
Can't disagree but the biggest target of his demographics argument is always East Asia, and the numbers there are truly dismal. S. Korea's latest numbers were 0.78. I really don't know how a population can ever recover from that
They easily could by actually putting in family friendly policies into place and abandoning the educational policies which turned childhood in Korea into a constant drill 24/7.