The Soviet Union became an Allied country when it was invaded by Germany on June 22, 1941. Germany and Italy declared war on the US on December 11, 1941; three days after the US declaration of war against their ally Japan. However, the Soviet Union did not move against Japan until near the end of the war, and only then because the US required it in return for Soviet territorial demands in Eastern Europe.
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Events preceding the Second World War, and even the Russian Revolution of 1917, underlay pre-World War II tensions between the Soviet Union, western European countries and the United States. A series of events during and after World War II exacerbated tensions, including the Soviet-German pact during the first two years of the war leading to subsequent invasions, the perceived delay of an amphibious invasion of German-occupied Europe, the western allies' support of the Atlantic Charter, disagreement in wartime conferences over the fate of Eastern Europe, the Soviets' creation of an Eastern Bloc of Soviet satellite states, western allies scrapping the Morgenthau Plan to support the rebuilding of German industry, and the Marshall Plan. = Wikipedia.com
Soviet Union was communist.
the rise of Communism
The Chernobyl disaster Brought about perestroika
they had many other allies and would defeat the powers of soviet union leaders, they also had more nuclear weapons.
Events preceding the Second World War, and even the Russian Revolution of 1917, underlay pre-World War II tensions between the Soviet Union, western European countries and the United States. A series of events during and after World War II exacerbated tensions, including the Soviet-German pact during the first two years of the war leading to subsequent invasions, the perceived delay of an amphibious invasion of German-occupied Europe, the western allies' support of the Atlantic Charter, disagreement in wartime conferences over the fate of Eastern Europe, the Soviets' creation of an Eastern Bloc of Soviet satellite states, western allies scrapping the Morgenthau Plan to support the rebuilding of German industry, and the Marshall Plan. = Wikipedia.com
The Cuban missile crisis, where the Soviet Union put missiles in Cuba.
Soviet Union was communist.
The bombing of Pearl Harbor
the rise of Communism
The short answer is: the cold war was the tension that arose between the Soviet Union and the United States after World War II. Many events during and after the war contributed to it.
The Chernobyl disaster Brought about perestroika
The fall of the Soviet Union
The August Revolt
The collapse of the Soviet Union in 1990.
they had many other allies and would defeat the powers of soviet union leaders, they also had more nuclear weapons.
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