This video is worth your time. It is long. But it is worth your time.
A longer post on similar themes is in the works. Until that post is completed this is an excellent place to begin the discussion.
"The New American Divide"
Charles Murray. Wall Street Journal. 21 January 2012.
A lengthy newspaper adaptation of Mr. Murray's book, Coming Apart: The State of White America, 1960-2010, which includes both the main argument and many of the data points discussed above.
"Growing Class Gaps in Social Connectedness Among American Youth"
Robert D. Putnam, Carl Frederick, and Kaisa Suelman. Saguaro Seminar: Civic Engagement in America. 8 August 2012.
This is study that Mr. Putnam uses as the foundation for his remarks.