Chronology Of World War 1
DECLARATIONS OF WAR

1914

July 28-Austria-Hungary against Serbia.
Aug. 1-Germany against Russia.
Aug. 3-Germany against France.
Aug. 4-Great Britain against Germany at expiration of ultimatum at midnight; Germany against Belgium
Aug. 5-Montenegro against Austria-Hungary.
Aug. 6-Austria-Hungary against Russia; Serbia against Germany.
Aug. 9-Montenegro against Germany; Austria-Hungary against Montenegro.
Aug. 12-Great Britain against Austria-Hungary
Aug. 13-France against Austria-Hungary.
Aug. 22-Austria-Hungary against Belgium ( received Aug. 28).
Aug. 23-Japan against Germany.
Aug. 25-Japan against Austria-Hungary.
Nov. 1-Russia against Turkey.
Nov. 2-Serbia against Turkey.
Nov. 5-Great Britain against Turkey; France against Turkey.

1915

May 23-Italy against Austria-Hungary.
June 3-San Marino against Austria-Hungary.
Aug. 21-Italy against Turkey.
Oct. 14-Bulgaria against Serbia.
Oct. 15-Great Britain against Bulgaria; Montenegro against Bulgaria.
Oct. 16-France against Bulgaria; Serbia against Bulgaria
Oct. 19-Italy against Bulgaria; Russia against Bulgaria.

1916

March 9-Germany against Portugal.
March 15-Austria-Hungary against Portugal.
Aug. 27-Rumania against Austria-Hungary; Italy against
Germany (to take effect Aug. 28)
Aug. 28-Germany against Rumania
Aug. 30-Turkey against Rumania
Sept. 1-Bulgaria against Rumania.

1917

April 6-United States against Germany.
April 7-Cuba against Germany; Panama against Germany.
July 2-Greece against Germany, Austria-Hungary, Turkey, and Bulgaria.
July 22-Siam against Germany and Austria-Hungary
Aug. 4-Liberia against Germany.
Aug. 14-China against Germany and Austria-Hungary
Oct. 26-Brazil against Germany.
Dec. 7-United States against Austria-Hungary.
Dec. 10-Panama against Austria-Hungary.
Dec. 16-Cuba against Austria-Hungary.

1918

April 23-Guatemala against Germany.
May 8-Nicaragua against Germany and Austria-Hungary
May 23-Costa Rica against Germany.
July 12-Haiti against Germany.
July 19-Honduras against Germany.

Breaking of Diplomatic Relations

1917

Feb. 3-United States with Germany.
March 14-China with Germany.
April 8-Austria-Hungary with the United States.
April 10-Bulgaria with the United States.
April 13-Bolivia with Germany.
April 20-Turkey with the United States.
April 27-Guatemala with Germany.
May 17-Honduras with Germany.
May 19-Nicaragua with Germany.
Sept. 21-Costa Rica with Germany.
Oct. 6-Peru with Germany.
Oct. 7-Uruguay with Germany.
Dec. 7-Ecuador with Germany.