Isolationism versus Internationalism · US History

Which of the following events most directly challenged the U.S. policy of isolationism in the Pacific prior to Pearl Harbor?

  1. The Japanese invasion of Manchuria in 1931
  2. The formal signing of the Treaty of Versailles in 1919
  3. The Mexican Revolution
  4. The completion of the Panama Canal
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Correct answer: The Japanese invasion of Manchuria in 1931

Japan's aggression in China violated the Open Door Policy and the Nine-Power Treaty. The U.S. responded with the Stimson Doctrine, refusing to recognize territories taken by force, which heightened tensions with Japan.

Difficulty: Medium Question 15 of 20

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