The Triumph of Tribalism - a podcast by BBC Radio 4

Andrew Sullivan on how America has become "a truly tribal society".

"I've lived here since the Reagan era", he writes, "and there have been plenty of divides. But none quite as tribal or as rooted in non-negotiable identity as this one".He warns of what the outcome might be and reminds the listener that a liberal democracy is always a precarious enterprise.

Producer: Adele Armstrong.

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