Because the book was wrong for the most part. We really didn't do anything to restrict population in the US, and without immigration our population would collapse.
China is in far worse shape, they restricted number of children for decades, and now they are presented with a demographics crisis that could halve their population in 60 years.
China is in far worse shape, they restricted number of children for decades, and now they are presented with a demographics crisis that could halve their population in 60 years.