In 1918 Hara Takashi became the first commoner to be in office as the prime minister, The two-party political system that had been developing in Japan since the turn of the century finally came of age after World War I.
Hara was assassinated by a disenchanted railroad worker in 1921.
The goal of the Nine Power Treaty (February 6, 1922), signed by Belgium, China, the Netherlands, and Portugal, along with the original five powers, was the prevention of war in the Pacific.
The stock-market crash decimated most of the world's economy. America began to request all of their stocks back and restrict their foreign policy effecting global trade and the world economy
In November 1936, the Anti-Comintern Pact, an agreement to exchange information and collaborate in preventing communist activities, was signed by Japan and Germany (Italy joined a year later). War was launched against China after the Marco Polo Bridge Incident of July 7, 1937, in which an allegedly unplanned clash took place near Beiping (as Beijing was then called) between Chinese and Japanese troops and quickly escalated into full-scale warfare.
The U.S's efforts for peace were in vain, because Japan was conspiring against them during the peace talks. Japan was desperate and was in need of anything that could help gain a better economy and a better moral for its people.