WWII

Although I am a boy, I cannot say I have a lot of World War II knowledge. I do know a lot about the holocaust, which is a part of the war. Hitler was the leader of the Nazis, and many minorities were targeted such as homosexuals, gypsies, and mostly, Jews. Six million total Jews were killed, mainly in concentration camps and gas chambers. There is also of course the bombings with Japan, where Japan bombed Pearl Harbor and the US later bombed Hiroshima.

I want to know why so many countries got involved in WWII. I also want to know how each individual country was influenced by WWII.