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Which of the following events gave President Wilson justification to declare war against the autocratic government of Imperial Germany?
The unrestricted submarine warfare that continued to sink American merchant vessels.
The British interception of The Zimmerman Telegram.
The downfall of Czar Nicholas II's government in Russia.
The German blockade of the British Isles that led to a nationwide famine in Britain.
The invasion of neutral Belgium by the Germans upon their advancement into France.