IB History Pearl Harbor Notes

Japan's Strategic Dilemma (1940-1941)

1. By 1940, Japan was bogged down in China with over 1 million troops committed to the war that had begun in 1937. Victory remained elusive, draining resources and manpower.
2. The fall of France and the Netherlands in 1940 left their Asian colonies (Indochina, the Dutch East Indies) vulnerable to seizure, creating a power vacuum in Southeast Asia.
3. Japan desperately needed oil, rubber, and tin from Southeast Asia. It imported roughly 80% of its oil from the United States, making the relationship critical to Japan's military capacity.
4. Two strategic options were debated within the Japanese military: the "Strike North" doctrine (attacking the USSR to seize Siberian resources) versus the "Strike South" doctrine (advancing into Southeast Asia for oil and raw materials). After the Soviet-Japanese Neutrality Pact of April 1941, the "Strike South" faction prevailed.
5. The Tripartite Pact (September 1940) bound Japan to Germany and Italy, signalling to the US that Japanese expansion was part of a broader Axis challenge to the international order.

The Road to Pearl Harbor

1. In September 1940, Japan occupied northern French Indochina with the agreement of the Vichy French government, gaining air bases closer to China and Southeast Asia.
2. The United States responded with a partial embargo on scrap metal and aviation fuel, a clear signal that further expansion would carry economic consequences.
3. In July 1941, Japan occupied southern French Indochina, positioning forces to strike at Malaya and the Dutch East Indies. The US, Britain, and the Netherlands responded by freezing Japanese assets and imposing a full oil embargo.
4. The embargo cut off approximately 75% of Japan's trade and 88% of its oil imports. With only an estimated 18 months of oil reserves, Japan faced a ticking clock: either negotiate a settlement or seize the resources by force.
5. Prime Minister Konoe Fumimaro sought a diplomatic solution, proposing a personal summit with President Roosevelt. Washington rejected the offer, insisting Japan first agree to broad principles of withdrawal.
6. Tojo Hideki replaced Konoe as Prime Minister in October 1941. Tojo set an internal deadline of late November for diplomacy to succeed; if it failed, Japan would go to war.

The ABCD Encirclement and Final Diplomatic Offers

1. Japanese leaders described the economic blockade as the ABCD encirclement (American, British, Chinese, Dutch), portraying Japan as a victim of coordinated Western economic aggression designed to strangle the nation.