Compare the expansion of government power during World War I and World War 2?

This question does not indicate which government, nation or type of expansion. In Europe during World War 2 monarchies ruled the nations and there were no expansions. They had to give up their monarchies after World War 1. This allowed nationalism and democracy to begin in Europe. When Hitler came into power he changed Germany's rule to a Dictatorship. Then after World War 2 Germany was able to return to democratic type government. In the US the only type of expansion was the United Nations being established in New York City.