If you want to know what is the disturbing data @LHSummers refers to , its author, @jburnmurdoch has just done a pretty comphensive thread with all the charts.
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RT @LHSummers: The most disturbing set of data on America that I have encountered in a long time. This transcends politics.

This is especially scary remembering that demographics were the best early warning on the collapse of the USSR. https://t.co/knrLf2GJkg…

🐦🔗: https://n.respublicae.eu/lugaricano/status/1641833643562659840