3. X

20. 1914: Serbia- July 28 Austria-Hungary- July 28 Russia – August 1 Germany - August 1 France – August 3 Belgium – August 4 England – August 4 Montenegro – August 5 Japan – August 23 Ottoman Empire- October 31 1915: Italy- May 23 San Marino – June 3 Bulgaria – October 14 1916: Portugal – March 9 Romania – August 271917: United States- April 6 Cuba – April 7 Panama – April 7 Greece – July 2 Siam - July 22 (Today it’s called Thailand) Liberia – August 4 China – August 14 Brazil – October 26 1918: Guatemala- April 23 Nicaragua – May 8 Costa Rica – May 23 Haiti – July 12 Honduras – July 19