Coming Apart by Charles Murray is an incredibly important book that goes into detail about this including immense amounts of statistical data. The core of American civilization is based on Judeo-Christian values and the fact that faith in those are rotting away is directly leading to slow-motion social collapse. I understand the average HN reader is probably areligious (the book goes into the class dynamics of why this is) and skeptical of anything not science-related, but the deleterious effects are serious and real.

https://www.amazon.com/Coming-Apart-State-America-1960-2010/...