Answer and explanation

Correct answer: A. 1939, when Germany invaded Poland

  1. Step 1: The war began a generation after the first one.
  2. Step 2: On 1 September 1939 Germany invaded Poland and Britain and France declared war.
Answer
1939, when Germany invaded Poland
Why not the others: 1914 was the First World War; Ethiopia was 1935-36; Pearl Harbor drew in the United States.

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