| Start Date | End Date | Event | |
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| 28 Jun 1914 | | Archduke Franz Ferdinand, heir presumptive to the throne of Austria-Hungary, and his wife Sophie, duchess of Hohenberg, are killed in Sarajevo by the Serbian man Gavrilo Princip a member of the Black Hand group. | |
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| 28 Jul 1914 | | Austria-Hungary declares war on Serbia. Russia mobilizes its armed forces in support of Serbia. This includes the sending of troops to its borders with Germany and Austro-Hungary. Germany threatens Russia that they must end all mobilization or be subject to war. | |
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| 01 Aug 1914 | | Germany declares war on Russia. This is in result to the Russians not ending their mobilization in preparation for World War 1 | |
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| 03 Aug 1914 | | Germany declares war on France. The French were also warned not to mobilize by Germany, however they did not listen. Also Britain reminds Germany that any invasion of Belgium would be considered an act of war. | |
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| 04 Aug 1914 | | Germany invades neutral Belgium. | |
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| 04 Aug 1914 | | In a result of Germany's invasion of Belgium. Great Britain declares war on Germany. Canada, Australia and other British colonies are thrust into war. USA proclaims nutrality. | |
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| 22 Apr 1915 | 05 May 1915 | Second Battle of Ypres marks first use of chemical weapons. | |
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| 23 May 1915 | | Italy declares war on Austria-Hungary. Although Italy was once an ally of Austria-Hungary they declared nutrality at the beginning of the war due to overwhelming social pressure. However, at a secret meeting held in England , representatives of the Italian government agreed to enter the war in return for financial help and the granting of land currently under the control of Austria-Hungary. | |
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| 01 Jul 1915 | 18 Nov 1915 | The Battle of the Somme results in an estimated one million casualties and no breakthrough for the Allies. | |
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| 06 Apr 1917 | | The United States declares war on Germany. President Wilson who had won re-election by promising that the United States have no involvement in the war now says : "The world must be made safe for democracy". | |
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| 09 Apr 1917 | 12 Apr 1917 | Battle of Vimy Ridge. The 4 Canadian Battalions all fight together for the first time. They gained a ridge of land that other countries had tried to get from the beginning of the war | |
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| 16 Jul 1917 | 10 Nov 1917 | Third Battles of Ypres, known as Passchendaele, results in minor gains, but still no breakthrough. | |
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| Aug 1917 | | Conscription instituted in Canada. All men between the ages of 19 and 45 would have to enlist. Although 400,000 were conscripted only 24,000 ended up serving. | |
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| 20 Sep 1917 | | On September 20, the Military Voters Act extends federal voting priveledges, until the end of the war, to women in the services and to those women who had close relatives in the armed services of Canada or Great Britain. | |
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| 05 Dec 1917 | 03 Mar 1918 | Russia signs an armistice with Germany on December 5, 1917. On December 15, 1917 the armistice is concluded between the Central Powers and Russia. Finally, Treaty of Brest-Litovsk signed by Soviet Russia and the Central Powers on March 3, 1918 . | |
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| 11 Nov 1918 | | The war ends as Germany and Allies sign an Armistice. | |
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| 12 Jan 1919 | 20 Jan 1919 | When the Armistice was signed on 11th November, 1918, it was agreed that there would be a Peace Conference held in Paris to discuss the post-war world. Opened on 12th January 1919, meetings were held at various locations in and around Paris until 20th January, 1920. Leaders of 32 states representing about 75% of the world's population, attended. However, negotiations were dominated by the five major powers responsible for defeating the Central Powers: the United States, Britain, France, Italy and Japan. Eventually five treaties emerged from the Conference that dealt with the defeated powers. The five treaties were named after the Paris suburbs of Versailles (Germany), St Germain (Austria), Trianon (Hungary), Neuilly (Bulgaria) and Serves (Turkey). These treaties imposed territorial losses, financial liabilities and military restrictions on all members of the Central Powers. | |
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| 28 Jun 1919 | | Treaty of Versailles signed by German delegates and Allies. | |