Problems

After World War I, U.S. President Woodrow Wilson led the effort to create the League of Nations, a forerunner of today's UN. But the U.S. Senate would not approve U.S. participation, and the League did not prove effective. U.S. isolationism between world wars, along wtih declining British power and Russia's withdrawal into revolution, left a power vacuum in world politics.

• Ethiopia
• Manchuria

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