Sasse's new book actually looks at this. I was reading the description of it today, and it basically said that the collapse of local communities, combined with

Sasse's new book actually looks at this. I was reading the description of it today, and it basically said that the collapse of local communities, combined with the rise of easy sharing, has essentially made political parties the new "tribes" in America. Seems like an interesting thesis, even if I don't agree with him on other things.