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In page Republics of the Soviet Union:

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The Karelo-Finnish Soviet Socialist Republic, a relic of the Soviet-Finnish War (the Winter War), became the only union republic to be deprived of its status in 1956. The decision to downgrade Karelia to an autonomous republic within the Russian SFSR was made unilaterally by the central government without consulting its population.[citation needed] The official basis for downgrading the status of the republic was the changes that had occurred in the national composition of its population (about 80% of the inhabitants were Russians, Belarusians and Ukrainians), as well as the need to reduce the state apparatus, the cost of maintaining which in 1955 amounted to 19.6 million rubles.[7]