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Declaration of neutrality
President wilson made public that the U.S. was going to remain its neutrality -
The Lusitania
The Lusitania is sunk without warning by a German submarine -
Sussex pledge
Germany agrees to stop sinking non military U.S. ships -
Zimmermann Note
A proposal for Mexico to join an alliance with Germany if the U.S. were to enter the war. Mexico rejected it, knowing it was much weaker than the U.S. -
Sussex pledge
Sussex pledge is broken when unrestricted warfare is resumed without warning -
American ships targeted
American ship was targeted and sank, killing American passengers -
Declaration of war
President Wilson declares war on Germany finally.
