Hitler. Soon after the fall of Berlin (Germany's capital), Germany surrendered leaving only Japan for the Allies to worry about.Many events caused the outbreak of W.W.II, American involvement in W.W.II, and the ending of the war. Nevertheless, there are some events that were more influential in bringing about the start of World War II than others, some events that were more influential in bringing about the United States' involvement in the war than others, and some events were more decisive in the ending of W.W.II. In any case, however, the eighteen events aforementioned events were all immensely significant in their various ways...