What caused world war 2
The desire to rule the world, greed. power, and being a fanatic.
the 5:5:3 ratio embargoing oil and steel to japan and the invasion of poland by the wechermat ( aka nazis) brought great Britain into it and pearl harbor brought us into japan
It was all of the alliances and tension between the European nations. Hitler and Nazi Germany were part of the tensions. WWII started when Hitler invaded Poland.That is very simplified. ask your history teacher for more details.