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Heimosodat was a Finnish "war" to either help the local populace gain independence or assert Finnish authority over land that was inhabited by other Baltic Finnish people. The Estonian war of Independence was the only success out of six expeditions (Here is a link that gives more info https://en.wikipedia.org/wiki/Heimosodat)
Could any of the other expeditions have been successful? How long could these new nations (or annexed land) exist for?