The correct cause-and-effect relationship which led to World War II is the aggressiveness of Japan, Italy, Germany and Treaty of Versailles’ that caused resentment for the German. Its effect is that this led to the use of nuclear weapons during the war and later led to the Cold War.
After WW2. The Big 3 were trying to find a new gov't for all the new countries formed. US wanted democracies. But USSR wanted communism for everyone...
In the Middle Ages, some people believed that denial of worldly pleasures would please God. During the Renaissance, many believed that God intended them to enjoy those things.