During the first half of the twentieth century, a lack of oil constrained Britain and Germany from exerting their economic and military power independently. Having fought World War I with oil imported from the United States, Britain was determined to avoid relying upon another great power for its energy needs ever again. Even before the war had ended, Whitehall began implementing a strategy of developing alternative sources of oil under British control. Britain’s key supplier would be the Middle East—already a region of vital importance to the British Empire, but one whose oil potential was still unproven. There turned out to be plenty of oil in the Middle East, but Italian hostility after 1935 threatened British transit through the Mediterranean. As war loomed in 1939, Britain’s quest for independence from the United States was a failure. Germany was in an even worse position than Britain. The Third Reich went to war dependent on petroleum synthesized from coal, meager domestic crude oil production, and overland imports—primarily from Romania. German leaders were confident, however, that they had sufficient oil to fight a series of short, localized campaigns that would deliver to them the mastery of Europe. Their plan derailed following Germany’s swift victory over France, when Britain refused to make peace. This left Germany responsible for satisfying Europe’s oil requirements while cut off from world markets. A looming energy crisis in Axis Europe, an absence of strategic alternatives, and ideological imperatives all compelled Germany to invade the Soviet Union in 1941—a decision that ultimately sealed its fate.
