The Rise of Japanese Militarism was Emperor Hirohito and his ambitions to expand the Japanese Empire as japan already have been a empire and been expanding but with the greed of hirohito he wanted more and with the lack of resources he lacked he invaded china and yeah With Germany it started when hitler came to rise and started bring the country back from collapse and started breaking parts of the treaty of world war 1 as he started to create Aircraft, And expanding his army from the limit of 100,000 set by the treaty of Versailles to around 2 million I believe by 1939, what also lead to that is Hitler's hate for the allies and ambitions to take back what was rightfully Germany's such as lands of Poland and France and to humiliate the French and British as they humiliated Germany in world war 1.