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I was just wondering about a scenario, in which Finland never left Russia in 1917 and became part of the Soviet Union.
Later - under Stalin in the 30s or early 40s - the Finnish SSR got united with Karelia and Kola.
That bigger Finland finally became independent in 1991.

How plausible is such a scenario and what would be effects on WWII, the USSR as a whole and further policies?
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