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Declarations of War

According to the U.S State Department's list, the nations involved in the conflict made declarations of war as follows:

Aug. 28, 1914 Austria against Belgium

Aug. 27, 1914 Austria against Japan

Aug. 9, 1914 Austria against Montenegro

Aug. 6, 1914 Austria against Russia

July 28, 1914 Austria against Serbia

Aug. 4, 1914 Belgium against Germany

Oct. 26, 1917 Brazil against Germany

Oct. 14, 1915 Bulgaria against Serbia

Aug. 14, 1917 China against Austria

Aug. 14, 1917 China against Germany

May 23, 1918 Costa Rica against Germany

Apr. 7, 1917 Cuba against Germany

Dec. 16, 1917 Cuba against Austria-Hungary

Aug. 13, 1914 France against Austria

Oct. 16, 1915 France against Bulgaria

Aug. 3, 1914 France against Germany

Nov. 5, 1914 France against Turkey

Aug. 4, 1914 Germany against Belgium

Aug. 3, 1914 Germany against France

Mar. 9, 1916 Germany against Portugal

Sept. 14, 1916 Germany against Rumania

Aug. 1, 1914 Germany against Russia

Aug. 13, 1914 Great Britain against Austria

Oct. 15, 1915 Great Britain against Bulgaria

Aug. 4, 1914 Great Britain against Germany

Nov. 5, 1914 Great Britain against Turkey

Nov. 28, 1916 Greece (Provincial Government) against Bulgaria

July 2, 1917 Greece against Bulgaria

Nov. 28, 1916 Greece (Provincial Government) against Germany

July 02, 1917 Greece against Germany

Apr. 22, 1918 Guatemala against Austria-Hungary

Apr. 22, 1918 Guatemala against Germany

July 15, 1918 Haiti against Germany

July 19, 1918 Honduras against Germany

May 24, 1915 Italy against Austria

Oct. 19, 1915 Italy against Bulgaria

Aug. 28, 1916 Italy against Germany

Aug. 21, 1915 Italy against Turkey

Aug. 23, 1914 Japan against Germany

Aug. 4, 1917 Liberia against Germany

Aug. 8, 1914 Montenegro against Austria

Aug. 9, 1914 Montenegro against Germany

May 24, 1918 Nicaragua against Germany

Dec. 10, 1917 Panama against Austria

Apr. 7, 1917 Panama against Germany

Nov. 23, 1914 Portugal against Germany (authorizing intervention)

May 19, 1915 Portugal against Germany (granting military aid)

Aug. 27, 1916 Rumania against Austria (accepted by Austria's allies)

Oct. 19, 1915 Russia against Bulgaria

Aug. 7, 1914 Russia against Germany

Nov. 3, 1914 Russia against Turkey

May 24, 1915 San Marino against Austria

Oct. 16, 1915 Serbia against Bulgaria

Aug. 6, 1914 Serbia against Germany

Dec. 2, 1914 Serbia against Turkey

July 22, 1917 Siam against Austria

July 22, 1917 Siam against Germany

Nov. 23, 1914 Turkey against Allies

Aug. 29, 1916 Turkey against Rumania

Dec. 7, 1917 United States against Austria-Hungary

Apr. 6, 1917 United States against Germany