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World War One:

Severance of Diplomatic Relations

The nations that formally severed diplomatic relations, whether later declaring war or not, are as follows:

Aug. 26, 1914Austria against Japan
March 16, 1916Austria against Portugal
July 26, 1914Austria against Serbia
April 8, 1917Austria against United States
April 14, 1917Bolivia against Germany
April 11, 1917Brazil against Germany
March 14, 1917China against Germany
Sept. 21, 1917Costa Rica against Germany
Dec. 7, 1917Ecuador against Germany
Aug. 13, 1914Egypt against Germany
Aug. 10, 1914France against Austria
July 2, 1917Greece against Austria
July 2, 1917Greece against Turkey
April 27, 1917Guatemala against Germany
June 17, 1917Haiti against Germany
May 17, 1917Honduras against Germany
May 18, 1917Nicaragua against Germany
Oct. 6, 1917Peru against Germany
June 8, 1917Santo Domingo against Germany
April 20, 1917Turkey against United States
Feb. 3, 1917United States against Germany
Oct. 7, 1917Uruguay against Germany