The document discusses Japan's strategy and success in the Pacific War which began in 1941 following a pre-emptive attack by Japan. Japan had initial military successes but their strategy of a "Greater East Asia Co-Prosperity Sphere" had weaknesses. The US contributed to the Allied war effort before declaring war and the Doolittle Raid on Tokyo in 1942 was an important turning point. The Battle of Midway in 1942 was also a major turning point, marking the end of Japan's expansion. Later, the US adopted a strategy of intense air attacks and firebombing of Japanese cities, culminating in the atomic bombings of Hiroshima and Nagasaki in 1945 that led to Japan's surrender.