Joseph Stalin is a textbook dictator that was not choosing means in order to strengthen his power and control of the country. Stalin's tactics were mostly consisted of fear, elimination, and imprisonment. In order to avoid and confrontations and strong political opponents, Stalin eliminated pretty much everyone that his people were able to capture and was posing a political threat to him in his eyes. These people were either killed in cold blood, or were taken in the Gulag where they died because of the terrible conditions. Everyone that was going to express an opinion against Stalin or the Communist Party was targeted and was ending up in prison, usually never coming home again. In order to nullify attempts for separatist movements, which was highly possible considering the numerous ethnic groups in the Soviet Union, Stalin was systematically killing, imprisoning, or relocating people of certain ethnic groups in order to break their nation core and identity.
It was the internal reforms of Mikhail Gorbachev, the last Soviet leader that led to the end of the Cold War
Light bulbs were the power source used in factories during the industrialization
You can consider it to be Isolated. The doctrine was about preventing anyone from Europe from participating in political activities in the new land, and it was proclaimed that any European force that tried to control or colonize countries in the new land would be considered to be unfriendly to the US and the US would help the countries under attack.
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I think this is mathematics not history...
