When did japan enter ww2?

Japan didn't enter WW2, Japan partially created WW2. Japan joined military alliance with Germany and Italy before the war. They attacked US deliberately to expand the war. read more

In World War I, Japan entered on the side of the Allied Powers and picked off Germany's colonial empire in the Pacific Ocean. This was probably the high-water mark of Japan's acceptance by the Western powers prior to 1945. read more

Japan didn't enter World War II - it STARTED World War II! It began with the invasion of China in 1936 and continued to Burma and Indonesia BEFORE Pearl Harbor was attacked and the Philippines invaded in December 1941. Japan wanted to bring the Asia into what they called the Greater Asia Co-prosperity Sphere. read more