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Austria-Hungary saw this as a direct attack on the country and they believed that Serbia helped the Bosnians which caused the next event.
Assassintion of Archduke Ferdinand -
Russia mobilizes its army to intervene against Austria-Hungary to help Serbia. This causes a chain reaction that sets off WW1 in Europe.
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Austria-Hungary declared war on Serbia because of the assassination, a few days later Germany declared war on Russia to help Austria-Hungary, France the Declared war on Germany to help Russia and WW1 had begun.
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German forces fired more than 150 tons of chlorine gas at the Allied lines in Ypres, Belgium. This event marked the beginning of lethal gas warfare.
Germans introduce poison gas -
The sinking of the Lusitania killed 1,198 of its 1,959 passengers, 128 of which were Americans. This event started to tighten the tensions between the US and Germany.
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After the sinking of the Lusitania and other neutral vessels, Germany suspends unrestricted submarine warfare to try and keep the US out of the war
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The British used the first tanks at Delville Wood. Not armored and not very effective weapon. More useful clearing paths
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President Wilson received a telegram from British intelligence, the telegram was a message from Arthur Zimmerman proposing Mexico side with Germany if the US declares war on Germany in exchange for the promise to return parts of America to Mexico.
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After Germany resumed unrestricted warfare in war-zone waters the US cit all diplomatic ties to Germany. Hours after a German U-boat sunk American liner Housatonic. Germany sunk four more American vessels after the US declared war on them
The US enters WW1 -
Congress passed the Selective Service Act that allowed the draft in the United States. Although it was criticized for infringing on the democracy President Wilson saw no other option and signed the bill. This grew the armed forces from 200,000 to 4 million by the end of the war.
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After fighting for four years in a stalemate the US entering the war, the well-supplied troops of the US nearly guaranteed the Allies victory in Europe
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Germany signs a peace treaty with the Bolshevik government of Russia. This treaty ends the war on the Eastern front allowing Germany to put all it's resources to the fight on the Western Front.
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U.S. Marines attack the Germans across an open field suffering a large number of casualties. The end of the battle marked the farthest Germany ever advanced into Paris
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An Armistice is signed ending the war on the Western Front
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