Map of Finland

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Finland was part of Sweden, a legacy reflected in the prevalence of the Swedish language and its official status. It was then incorporated into the Russian Empire as the autonomous Grand Duchy of Finland, until the Russian Revolution of 1917 prompted the Finnish Declaration of Independence. This was followed by the Finnish Civil War in which the pro-Bolshevik Finnish Socialist Workers' Republic was defeated by the pro-conservative "Whites" with support from the German Empire. After a brief attempt to establish a kingdom, the country became a republic. In World War II, Finnish forces fought in three separate conflicts: the Winter War (1939–1940) and Continuation War (1941–1944) against the Soviet Union and the Lapland War (1944–1945) against Nazi Germany. Finland joined the United Nations in 1955 and established an official policy of neutrality. It joined the Organisation for Economic Co-operation and Development (OECD) in 1969, the European Union in 1995, and the Eurozone at its inception in 1999.