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I was watching a documentary about the relationship between the USA and USSR in the final days of World War 2, and it mentioned that Stalin arrived a day late to the Potsdam Conference, possibly because of a mild heart attack.

So what would have happened if that had been a major heart attack, and Stalin had been killed (or, if you want to use something other than a fatal heart attack, slipped into a coma)? Would the Cold War have started, and if so, would the Eastern Bloc be as large, or indeed as tied to the Russian seat of power?
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