World War 2 is about to happen because Adolf Hitler has been making promises to Germany. He said since we had to pay for all the damage that happened in World War 1, let's show them who's boss. They blamed us, so let's get back at them. We need to fight and show that we are a strong country. So after he made all the promises, he started World War 2 by attacking other countries.
Adolf Hitler was the leader/dictator of the Nazis, or the National Socialists. He started running as leader in 1933. Hitler blamed the Jews for Germany's problems. He then put them in concentration camps.