It changed the name of "The War to End All Wars" to "WWI".It also proved that you cannot be abusive or excessively harsh to a country when you were victorious in War or, they will act with hatred...
When WWII ended, the United Nations, North Atlantic Treaty Organization and the Warsaw Pact had been formed and communism had spread. Also, many places were in ruins.
Over 2 million people died, over a 100 people were wounded. People starved because the goods were in short supply so people had to limit the amount of goods people can buy. This was called rationing.