WWI By shawnnaw 1823 the Monroe doctrine 1914 the great wall 1914 German and English soldiers stopped fighting for Christmas eve Period: 1914 to 1918 the war of nations 1915 Germany told Americans to stay off British ships 1917 Britain stopped all German ships going to america 1917 Germany announced unlimited warfare 1917 Russia left the war after its communist revolution 1917 the espionage act Apr 7, 1917 New York journal announcing the declaration of war 1918 the sedition act