In the "Things People Believe for Ideological Reasons" thread, I said a neo-Confederate putsch during the Korean War was roughly equivalent to the Bolshevik coup in the Civil War in terms of legitimacy.
So with a POD no earlier than, say, 1865, how can we get it so that during the Korean War, neo-Confederates seize control of Washington D.C. and turn over a substantial chunk of U.S. territory to the Chinese, a second American Civil War breaks out, and other members of NATO/the UN make a half-hearted attempt to assist elements of the old U.S. government opposed to the new regime?