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In page Demographics of Estonia:

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The demographics of Estonia in the 21st century result from historical trends over more than a thousand years, as with most European countries, but have been disproportionately influenced by events in the second half of the 20th century. The Soviet occupation (1944–1991), extensive immigration from Russia and other parts of the former USSR, and the eventual restoration of independence of Estonia, have all had a major effect on Estonia's current ethnic makeup.[citation needed]