What Japan wanted in Southeast Asia

G2 Full History - syllabus K227, 2027

What this lesson teaches

  • I can explain how leaders, governments and the League took steps that led to World War II.

    Syllabus K227, War in Europe and the Asia-Pacific, Learning Outcomes. Explain the roles played by individuals and groups in developments leading to the outbreak of World War II.

Make a guess

In 1940 Japan announced the Greater East Asia Co-Prosperity Sphere, promising freedom from Western rule. What do you think Japan really wanted?

  1. To help Britain and France defend their colonies in Asia.
  2. To lead the region and control its oil, rubber and tin.
  3. To make each Asian colony a free and equal partner.
Show the answer

To lead the region and control its oil, rubber and tin.

The promise helped justify expansion. Southeast Asia's resources would let Japan fight on without Western suppliers.

Japan called its plan Asian cooperation, but it really wanted to lead the region and control its oil, rubber and tin.

In 1940, Japan announced the Greater East Asia Co-Prosperity Sphere. It promised shared wealth and freedom from Western rule. But Japan would lead. The promise helped justify expansion. It did not mean the peoples under Japan would rule themselves.

Southeast Asia had oil in the Dutch East Indies, now Indonesia. British Malaya had rubber and tin. These would help Japan keep fighting without Western suppliers. In 1940, Germany defeated France and the Netherlands, and Britain was busy fighting in Europe. Their Asian colonies looked weak.

Japan moved into northern French Indochina in 1940 and the south in 1941. This brought its forces closer to Malaya and the Dutch East Indies. But moving south risked war with Britain, the Netherlands and the USA, which held the Philippines.

Co-Prosperity Sphere, 1940
Japan's plan for an Asia it would lead.
Resources
Oil in the Dutch East Indies; rubber and tin in Malaya.
Indochina
Japan moves in, north 1940 and south 1941.

Worked example: Check the promise against who holds power

A student says a promise to free Asia proves Japan would bring independence.

  1. The slogan promises unity and freedom from Western rule.
  2. But Japan would lead and control the oil and other resources.
  3. So ask who makes decisions. The promise alone does not answer that.

Watch out for this

The Co-Prosperity Sphere meant equal, independent partners.

Japan would lead the sphere and control its resources. The partners would not be equal.

Check your understanding

Why did Southeast Asia matter so much to Japan?

  1. It had oil, rubber and tin Japan needed to keep fighting.
  2. It was the main market where Japan could sell its silk.
  3. Its peoples had asked Japan to free them from Western rule.
Show the answer

It had oil, rubber and tin Japan needed to keep fighting.

Yes. Controlling these would reduce Japan's reliance on the West.

Sources and context

Background reading for this chapter.

  • National Archives: Day of Infamy Address

    Paraphrase of the US National Archives account of Roosevelt's 8 December 1941 address to Congress; retrospective archive description.

  • The road to Pearl Harbour

    Paraphrase of the US Office of the Historian's historical account, Japan, China, the United States and the Road to Pearl Harbor, 1937-41.

The Wise Otter

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