US will be fine as USSR thought it would be fine.
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US will be fine as USSR thought it would be fine.
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US will be fine as USSR thought it would be fine.
There are other examples of possibilities than the USSR.
Western Europe gave up most of their colonial possessions after WW2. They ended up fine. Arguably better off, even.
Ancient Rome went through many periods of crisis and getting their shit back in order. The Eastern half of the Empire went on for about another 1000 years after the split--it lasted almost long enough to see Columbus get completely lost and stumble on some land. At one point, it held almost the whole territory of the original Roman empire, albeit briefly.
There are a million ways this can go. Liberal America could reassert itself more or less as it was. It could break into coalitions of loosely affiliated states kinda like Prussia. It could undergo great reforms and fix a lot of problems with its structure of government. I couldn't even guess which is more likely right now.