There is no exact date that marks the beginning of the Cold War, but its deepest roots are found in early 1900s with the Russian revolution. The people of Russia were unsatisfied with the czarist government in place. In 1917 the government was overthrown and Vladimir Ilich Lenin established a new communist government. The Union of Soviet Socialist Republics was formed. Under the new rule, all opposition to the government was eradicated, including external obstruction. The Soviets called for a worldwide revolution against capitalism, which they viewed as an enemy and a threat to their state. This was the first punch thrown in the long fight of the Cold War.
It is widely accepted that the intense rivalry of the Cold War begun in the years to follow World War II, more precisely the aftermath of the Yalta Conference. In the midst of World War II, Germany defied a cease-fire agreement between them and the Soviet Union. The Soviets were quick to respond by joining the Western allies (France, Great Britain, and later the United States). It seemed that a lasting trust could be formed between the United States and the Soviet Union due to their wartime cooperation, but it would deteriorate quickly enough