Question

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Explanation:

• Option A: The U.S. declared war on Japan after the Pearl Harbor attack (1941), not directly in response to the Nanjing Massacre (1937).
• Option B: The U.S. did not send troops to Nanjing during the massacre; their presence was limited to a small diplomatic/safety zone.
• Option C: The U.S. never joined the League of Nations.
• Option D: After events like the Nanjing Massacre and Japan’s aggression in China, the U.S. responded by imposing economic sanctions, including cutting off trade (e.g., oil, scrap metal) with Japan to pressure them to stop aggression.

Answer:

D. By cutting off trade with Japan