What were the key events in its development?Which side was responsible?

The Cold War

In a minimum of 250 words answer the questions below.

Questions:

International affairs in the postwar era were dominated by the Cold War.

1) What were the key events in its development?

2) Which side was responsible?

3) Given the political, military, and ideological situations at the time, was the Cold War unavoidable? Support your conclusions.