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"Bowling Alone: The Collapse and Revival of American Community" and such.

There are many contributing factors, not just screens, location mobility, or the decline of religion (churches being civic/social functions).

Parks used to have water fountains. Can't hardly find those anymore.

Children's parks used to have cool installations like decommissioned Korea era fighter jets in the sand pit and crawl-through metal sculptures. Those are all gone, replaced by perfectly safe, commercial, prefabricated sets.