Aggressiveness lead to the upcoming of WWII when the countries of Europe were trying to gain power, and by doing so, they would invade other European nations. Germany was one of those countries that harshly used violence in order to achieve power. The invasion of poland was one of the reasons that lead to the upcoming of WWII. Orders given by Hiltler demanded that soldiers were to invade Poland and wipe out all of the jews living in the attacked area.
Japan's constant attack in Asia aided in the approach of WWII. Japan killed thousands of chinese by hand during a long term period. The country also invaded thousands of nations throughout Asia and therefore caused the death of thousands of people. They would freeze people alive, test weapons on prisoners and also infect people with plahgue guns.
