<span>the Union of Soviet Socialist Republics abbreviated to the USSR or a shortened to the Soviet Union, was a Marxist–Leninist state on the Eurasian continent that existed between 1922 and 1991.
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Renewable energy sources are important in Eastern Europe because they allow sustainable development.
The aryans stopped being pastoral nomads and became farmers. The creation of the iron plow and the use of irrigation made it possible for them to turn the jungle along the Ganges river into farmland