What tactics did Stalin use to take control in Eastern Europe?

How did the USA react to Soviet expansionism?

"The United States was to blame for the start of the Cold War." To what extent do you agree or disagree with this statement?

Stalin used the USSR's winter to his advantage; By the Cold War; I somewhat agree to this statement.

Explanation:

1. In 1943, the USSR proved to Nazi Germany that they had specialty-trained soldiers based in Siberia ready to deploy.

2. Because the USSR's expansion threatened the US's nuclear dominance over the world.

3. Because of the US's use of nuclear weapons, the USSR felt they had to respond by expansionism and after that the US and the USSR began the Cold War. (But then again, if the US decided not to use nuclear weapons, Japan would arguably take over America and change it in many unprecedented ways.