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On November 9, 1989, after almost 30 years of west and east Berlin being split by a 14 foot wall made of concrete the people of Berlin tore down the concrete wall themselves.

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The Russian word Glasnost means openness. created by Gorbachev in the 1980s, this was the Soviet policy of open discussion of political and social issues.

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To prevent further conflict SALT (Strategic arms limitation talks) there were two rounds of meetings discussing international treaties between the US and the Soviet Union.

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To calm down stressed and tense relationships between countries.

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The Soviet Union led Warsaw troops into an invasion in Czechoslovakia on august 20, 1968. The goal was to break down on reformist trends.

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De-Stalinization is a state of change and many political changes in the soviet union after the death of Stalin in 1953.