Archduke Franz Ferdinand of Austria-Hungary is assassinated by Gavrilo Princip
Austria-Hungary declares war on Serbia in retaliation of the assassination
150 tons of chlorine gas were deployed in Ypres, Belgium. This was the first instance of chemical warfare.
German U-Boat sinks the British Lusitania, causing the death of 1198 including 128 Americans
Germany renewed its policy of submarine warfare that it had abandoned in 1915 after the sinking of the Lusitania. All ships trading with Britain would be targeted by German submarines, which included US ships as well. The United States decided to retaliate
A series of assaults against the Central Powers starting from August 8th to November 11th.
Germany is required to surrender several military units and their areas of occupation in East Africa are to be abandoned. Everyone must participate in a 30-day cease fire
The Treaty of Versailles was the treaty that ultimately ended the state of war between the Allies and Germany, thus ending WWI