The following two photos show German aggression in Europe because in the first picture, it is preventing people from shopping at stores because some thought and/or knew it was owned by a Jew. In the second photo, it also shows aggression because it is giving Germany's people a lot of hope and trying to show strength to the countries around it.
In the following two photos, you witness Japanese aggression in Asia. In the first photo, you can see Japanese troops beating on China's citizens. In the second photo, you can easily see a Japanese plane dropping a bomb on China which is, of course, aggression.
The following map is a map of the world during WWII. It shows the different sides of the war.