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The Triple Alliance was an alliance between Germany, Austria-Hungary and Italy. They promised to protect one another in the instance of war or attack from any countries outside the alliance.
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Kaiser Wilhelm II's father dies, so he becomes the new ruler of Germany.
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France and Russia create an alliance under the terms one would back the other if they went to war or would help defend if they were under attack.
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During the arms race, many new technologies and advancements in weapons were made, including Britain's "dreadnought" battleship and chlroine gas, which was being developed by the Germans.
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The Triple Entente was the alliance between Britain, France and Russia.
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The Austrian prince separates Austria from Bosnia and Herzogovnia
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Archduke Ferdinand was the heir to the throne of Austria-Hungary, and was assassinated on a tour of Sarajevo. He and his wife were both shot by Gavrilo Princep, who was a member of the Black Hand, a radical group.
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July 1914 is considered the offical start of the war, when Austria-Hungary declared war on Serbia. After this, through alliances, other countries joined the fighting.
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Britain delcared war on Germany because they promised Belgium, a neutral country, that they would protect them. Since the Schlieffen plan involved crossing through Belgium to invade France, Britain kept their promise with Belgium and declared war on Germany
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The two parties take up their sides and create both metaphorical battle lines and physical ones, such as trenches.