Why were world war one and world war 2 the most important wars?
Without the Revolutionary War there would be no United States. Most historians think the Civil War was the most important in the formation of the nature of American society. WWI and WWII were the most important US wars to Europe and to people who think the world did not exist before the 20th century. Compared to the other 20th/21 century wars, the major ones being Korea, Vietnam and now Iraq, there is really no contest. In the latter 3 wars there was no declaration of war but were started by a presidential initiative, and had little public support or enthusiasm and they did/will not end with a clear US victory. All three were proxy wars against an enemy who had only a peripheral interest in the outcome, and would not be defeated, even if the US achieved total victory.