The armies and technology of World War II required a vast supply of resources. A close look at Germany and Japan shows how the need to secure those resources played a significent role in determining strategy throughout the war. The armies of World War II needed a vast supply and variety of resources. The Allies had many of those resources on their side, but the Axis powers did not. Germany imported many of its resources from countries it would soon be fighting, and needed their war strategy to account for the acquisition of those resources. The Molotov-Ribbentrop Pact signed with the USSR set up a trade agreement to bring them oil from Russia for a while, in addition to establishing temporary non-aggression with the Soviets. When the war began in earnest, Germany targeted Norway with its supply of aluminum and iron as well as its access to the even more resource-rich Sweden. Conquering France also gave them access to rich farmland to feed the troops. But even though they had gained control of the oil fields in Romania, it wasn't enough to power their war machine. Many Nazi generals wanted to target North Africa for this, but Hitler had his sights set on the Soviet Union and wound up squandering much of Germany's reserves in a fruitless effort there. Meanwhile, Japan's entrance into the war had cost them their primary trading partner: the United States. The Japanese army wanted to pursue the Northern Expansion Doctrine (Hokushin-Ron) and push through China into Siberia, wounding the USSR in the process. They attempted this strategy, but the Soviets met them in Mongolia and pushed them back in the Battle of Khalkhin Gol. So they turned to the Southern Expansion Doctrine (Nanshin-Ron) advocated by the navy, and began to sweep up islands in the Pacific. They planned to strip the European colonial powers of their holdings, and they succeeded in capturing 90% of the world's rubber production. But the US responded by synthesizing rubber, and built an industry so large t