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Austria issues an Ultimatum to Serbia. They tell serbia if they don't meet terms of Ultimatum then there will be war.
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Archduke of Austria Franz Ferdinand and his wife Sophie were assasinated by Gavrilo Princep of black hand.
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They accept the ultimatum but would like to change some of the agreements. Austria denies it and declares war on Serbia.
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Millions of soldiers marched off to war, thinking war was going to be short. The war is not short. It takes about 4 years.
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Germany uses the schieffen plan. This was supposed to be quick. It turns into a stalemate on the western front.
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Allies attacked Germans. They attacked the Germans northeast of paris in the valley of the marne River.
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Austrians and Germans defeated the Russians. Then drove them eastward.
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Opposing armies on the western front had dug trenches. These are paralel ditches for miles and miles. These protected the armies during wars.
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Gallipoli campiaign - britain, Austria, New Zealand and france attacked west side of straits of dardenelles near constantinople.
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Allies gave up on the gallipoli campaign. They gave up on this after 250,000 casualties.
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Russia is suffering from a lot of political turnoil. There war effort is on the verge of collapsing.
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British forces try to help the french by attacking the germans at the battle of the somme. They suffer more than half a million casualties.
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Germans announce that they will bring back there process of Unrestricted Submarine policy. They will sink any ships aroun british waters withouth warning,
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British accepts the zimmerman telegram.
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Civil unrest in Russia is bringing Tsar Nicholas's goverment to brink of collapse.
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President wilson asks congress to declare war on the side of the allies.