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Germany's decision to attack and sink neutral ships led the United States to:

protest
strengthen its spy system
enter World War I
retreat into isolationism

1 Answer

6 votes

Answer:

Why did Germany's use of U-boats lead to conflict with the United States? Ships had no warning or defense against U-boats; submarines attacked American and other neutral ships; the German government broke its promises about restricting its submarines.

:

User Dunli
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