Q. From which country Estonia gained independence in 1991?
Answer: Soviet Union
Notes: In its early period, Estonia was under the colonial subjugation of Germans, Danes, Swedes, Poles and Russians. In 19th and early 20th centuries, Estonia witnessed a movement promoting and propagating "Estonian National Awakening" in which Estonians started acknowledging themselves as a nation deserving the right to govern themselves. This lead to the Estonian War of Independence from 1918 to 1920 which lead to the Estonian victory and the signing of the Tartu Peace Treaty, finally proclaiming the independence of Estonia from Russia. After independence, initially, Estonia followed a democratic political system which got culminated into an authoritarian rule post-Great Depression period from 1934 to 1940. This period was known as the Era of Silence. During World War II from 1939 to 1945, Estonia was under German and Soviet Union occupation, which finally ended with Soviet Union subjugation of Estonia through a puppet government, so as to continue the de jure status of Estonia. Annoyed with the subjugation of Soviet Rule, Estonians started "Singing Revolution" from 1987 to 1991 seeking the restoration of independence of Estonia, Latvia and Lithuania from Soviet Rule. This lead to the formal restoration of independence of Estonia from the Soviet Union in 1991.