Multiple choice

Because Germany invaded Belgium in order to attack France,

  1. Belgium joined an alliance system.

  2. the United States entered World War I.

  3. the United States agreed to join the Allies.

  4. Great Britain honored a pledge to protect Belgium; declared war on Germany.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Germany's invasion of neutral Belgium in 1914 violated the Treaty of London, which guaranteed Belgian neutrality. This prompted Great Britain to declare war on Germany to honor its pledge.

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