Did anybody ever read the Ussuri River War Saga on othertimelines.com? The premise is that USSR and PRC go to war over the Ussuri River region in the 60s. A Chinese nuclear weapon is used on Los Angeles, Lyndon Johnson remains as president for 10 years, the USSR allies with America and immediately liberalises (I believe there was something about Brezhnev and Andropov being publicly baptised to mark the restoration of the Orthodox church), the Democrats and Republicans swap the White House a few times but there's no tangible difference in America's government despite using politicians who had very different views and motivations, there's a bit where the Israelis form an alliance against Egypt with every other Arab state, one part where Margaret Thatcher oversees the unification of Ireland and Ian Paisley is talked down from kicking things off, I remember there was something about Ronald Reagan announcing his candidacy for the presidency... in 1992.
It's pretty bizarre inasmuch as it presents a world almost completely bereft of conflict after a certain point and the result is predictably boring. In retrospect, it read like a teenager read The End of History and the Last Man and got really, really, really into it.