What were the causes, main events, and effects of the early Cold War?

Causes: tensions between nations after ww2, conflict between u.s. and the soviet union, the emergence of nuclear weapons, etc.
main events: berlin blockade (1948), korean war (1950), space race (1957), cuban middle crisis (1962), etc.
effects: millions of people lost their lives in korea, vietnam, and other parts of the world where the war took place; russia was left with a devastated economy; the marshall plan took place