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U-boats begin sinking merchant ships
After finding contraband on British ships, U-boats would sink the merchant ships -
Great Britain Mounts guns on merchant ships
British merchant ships begin sinking U-boats instead of allowing German inspectors on board. -
U-boats begin unrestricted submarine warfare
Germany allows U-boats to sink British merchant ships without warning. -
U-boat sinks Lusitania
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Germany agreed to stop sinking passenger ships without warning.
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Battle of Jutland
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Sussex Plege
Sussex sunk - Americans threatened Germany and Germany promised to stop sinking ship without warning -
Germany announced unrestricted submarine warfare would resume
Germany hoped to end the war in Europe before U.S. could join the fighting. -
Zimmermann Note uncovered
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Broke off Dplomtic Ties with Germany
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U.S. armed merchant ships
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Russian Revolution - Democratic government takes over
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Germany sank 3 ships
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U.S. Declares War on Central Powers