It was a constitutional federation of socialist states, which existed in Eurasia from 1922 until its dissolution in 1991.
The USSR was born as a union of four Soviet socialist republics, formed after the October Revolution of 1917, and grew to 15 by 1956.
The geographical boundaries of the Soviet Union varied over time, but after World War II, from 1945 to its dissolution, the boundaries corresponded approximately to those of the extinct Imperial Russia, with notable exclusions from Poland, most of Finland and Alaska.
It was often improperly referred to as Russia, being its largest and most dominant constituent state. From 1945 to 1991, in the period known as the Cold War, the Soviet Union and the United States were the two world superpowers that dominated the global agenda of economic policy, foreign affairs, military operations, cultural exchange, scientific developments including the initiation of Space exploration, and sports (including the Olympic Games).
Over and above the mistakes that led to its disappearance this country played an essential role in the defeat of fascism and in the advance of humanity towards new forms of social organization more just and united.
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