I was going to recommend that as well. Am in the process of reading it, after a previous recommendation on HN. Or as the previous commenter quipped to a similar question 'Yes, Robert Putnam identified all these trends by the 80s and 90s, but nobody liked how gloomy he was about it.'

Link: https://www.amazon.com/Bowling-Alone-Collapse-American-Commu...

https://en.m.wikipedia.org/wiki/Robert_D._Putnam