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In June of 1914, the archduke of Austria-Hungary, Franz Ferdinand, visited Bosnia and Herzegovina where a man shot him and his wife. Franz had narrowly escaped a different assassination attempt hours earlier, when Gavrilo Princip killed the archduke outside of a sandwich shop.

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Austria-Hungary Delivers Ultimatum to Serbia/Declares War

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Austria-Hungary Delivers Ultimatum to Serbia/Declares War

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Following the assassination of Franz Ferdinand, Austria-Hungary delivers an ultimatum to Serbia. The ultimatum included demands to investigate the assassination and to condemn the propaganda against Austria-Hungary. When Serbia did not comply, Austria-Hungary declared war, in July of 1914.

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This battle, which took place in October of 1914, happened because the German army was attempting to break through Allied lines and capture French ports on the English Channel. This battle saw the first uses of trench warfare, which would be heavily used throughout the war.

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This campaign was headed by Winston Churchill and landed in the Gallipoli peninsula in April of 1915. The campaign's main goal was to establish a way to attack German and Austria from the east, while also establishing a link with Russia.

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In May of 1915, German submarines attack the Lusitania. This was unrestricted submarine warfare - which means no warning was given to the ship. Around 1,200 people were killed, which included 128 Americans.

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This battle, occurring during July of 1916, is known to be one of the deadliest of World War 1. There were over  a million casualties. When the battle was over, the Allies had only gained a few kilometers on the Central Powers.

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In January of 1917, Germany continued to attack neutral ships with Americans onboard and while also considering the Lusitania, the U.S grew angry. U.S. citizens grew more and more upset until the U.S declared war on Germany in April. The first U.S troops arrived in France at the end of June.

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On November 3, 1918, Austria-Hungary surrendered. The Austro-Hungarian army had grown very weak and could no longer keep fighting. The terms of armistice was signed by General Weber, the head of the Austro-Hungarian comission.

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In January of 1918, President Woodrow Wilson (of the U.S) proposed a plan called the Fourteen Points. This was Wilson's plan for lasting peace. It had many goals and points, but one of the biggest things to come from it was the League of Nations. This was the first intergovernmental organization created to promote World Peace.

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Peace Conference where the Treaty of Versailles was Signed

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The Treaty of Versailles was presented at the peace conference to finally end World War 1, which was held in June of 1919. The treaty listed a few conditions, some of which were: Germany had to pay $33 billion to the Allies in war reparations, and they could not have an army. These conditions angered Germany and built up resentment, which made lasting peace unlikely.