Hitler and his ideas to destroy the jews

mid-1937, following the Marco Polo Bridge Incident, Japan began a full invasion of China. The Soviets quickly lent support to China, effectively ending China's prior cooperation with Germany. Starting at Shanghai, the Japanese pushed Chinese forces back, capturing the capital Nanjing in December. In June 1938 Chinese forces stalled the Japanese advance by flooding the Yellow River; though this bought time to prepare their defenses at Wuhan, the city was still taken by October.[23] During this time, Japanese and Soviet forces engaged in a minor skirmish at Lake Khasan; in May 1939, they became involved in a more serious border war[24] that ended with signing a cease-fire agreement on September 15 and restoring the status quo

The attack on Pearl Harbor.
A way to get out of the Great Depression by making millions of jobs.

it was because Hitler hated jews, so he tried to kill all of them and then people wanted to fight back and thats the reason i think.

Archduke Franz Fernidad got shot while visitng another country and the people of Austria-Hungary were mad.

the Hungarians (Hungary) assassinated some Austrian