Don't have a lot of time, but need to introduce students to the causes of World War II?
This POWERPOINT and NOTE SHEET make for a quick introduction or refresher on the causes that led up to the war. You can use this as a base and add to it (either more content or additional interesting info) as you see fit.
It covers motivations for the Axis Powers (Italy and Germany), and the eventual Tripartite Pact (Japan).
After using this presentation in class, I following it up with a video about Pearl Harbor.