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This is a big one, and I'm not sure it can be done, but could there be a way to have a completely mirrored ending to the Cold War? This would involve:
Gradual American economic decline throughout the 1980s
Communist revolutions in its NATO allies in 1989
The dissolution of the United States in 1991 along regional lines, most of the constituent parts becoming Communist states
The popular discrediting of liberal capitalism as an ideology
I've really got no idea what kind of structural faults could develop into problems serious enough for this to happen, but I'd like to hear what anyone else thinks.