What were the main factors responsible for the Cold War?

Firstly, the USA and USSR co-operated with each other during the Second World War. But as soon as the common enemy was defeated the relation between the two reverted to what it had been prior to the World War II.

Secondly, the possession of the Atom Bomb by the USA was looked upon by the USSR with suspicion. Till USSR possessed the Atom Bomb it was under the fear that the USA might attack USSR.

Thirdly, the formation of the two Blocs one under USA and the other centering USSR kept the relation between the two surcharged with suspicion.

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Fourthly, the formation of military pacts like NATO, Warsaw Pact, and others worsened the relations between USA and USSR. These were some of the many factors responsible for the Cold War.