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  Archducke Franz Ferdinand assasinated
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  Joined the war
- 
  
  Joined the war
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  U.S. declares that they will remain neutral
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  Joined the war
- 
  
  Joined the war
- 
  
  Joined the war
- 
  
  Joined the war
- 
  
  Joined the war
- 
  
  Joined the war
- 
  
  The lusitania was sunk by the German U-boats, killing Americans
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  Joined the war
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  Joined the war
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- 
  
  Joined the war
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  German U-boats agreed to warn American ships before sinking them
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  Germany promised Mexico, that if the attacked the U.S., they would give the land from the U.S.
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  Germany did not follow through with the pledge
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  American ships targetted by German U-boats
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  U.S. declared war after they tried to remain neutral
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  Joined the war
