Alternate History

Treaty of Simpsonhafen (Loyal Italy)

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Treaty of Peace between the Central and Associated Powers and Japan
Signed February 22, 1917
Location Simpsonhafen, German New Guinea
Effective March 1, 1917


  • Germany
  • Italy
  • Austria-Hungary
  • Ottoman Empire
  • Bulgaria
  • Japan
Depositary German Government
Languages German, Japanese, Italian


  • Japan gains control of all of Sakhalin Island (the Russian part had been acquired by Germany in the Treaty of Charlottenburg)
  • Germany regains control of German Samoa and German New Guinea
  • Japan gains control of the port of Tsingtao in China
  • All signatories agreed to not block access to sea for any body of water, not including rivers within a country. 
  • The Central Powers agreed not to tax Japan for use of the Suez Canal


The treaty was the only one in which the Central Powers lost as much as, if not more, than they gained. This, coupled with changing of the balance of power in Europe, allowed Japan to become a major power on the world stage. 

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