Roosevelt died and Truman became the new President
Truman disliked Stalin and The USSR
Churchill lost the election and replaced by Attlee
Demilitarisation of Germany
Divide Germany and Berlin
Democracy in Germany and free elections
Nazi party was banned and executed
Germany paid reparations to USSR
USA & UK want to help Germany but USSR disagreed
Truman has created A-bomb and tested it
Stalin feels betrayed and threatened since USA and UK created the A-bomb together