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(Archduke Ferdinand)(https://www.history.com/news/the-assassination-of-archduke-franz-ferdinand-100-years-ago)
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(germany vs. russia)(http://www.historyplace.com/worldhistory/firstworldwar/index-1914.html)
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(germany vs france)(https://www.reference.com/history/did-germany-declare-war-france-f150f7a056f2779f)
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(great Britain vs germany)(https://www.historylearningsite.co.uk/world-war-one/causes-of-world-war-one/the-british-declaration-of-war/)
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(first battle of marne)(https://www.ducksters.com/history/world_war_i/first_battle_of_the_marne.php)
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(battle of Gallipoli)(https://www.thoughtco.com/world-war-i-battle-of-gallipoli-2361403)
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(sinking of Lusitania)(http://www.eyewitnesstohistory.com/snpwwi2.htm)
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(battle of the somme)(https://www.firstworldwar.com/battles/somme.htm)
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(first tanks)(http://ww1facts.net/the-land-war/ww1-tanks/)
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(zimmermann telegram)(https://www.archives.gov/education/lessons/zimmermann)
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(battle of caporetto)(https://www.britannica.com/event/Battle-of-Caporetto)
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(armistice day)(https://www.va.gov/opa/vetsday/vetdayhistory.asp)
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(treaty of Versailles)(http://www.newworldencyclopedia.org/entry/Treaty_of_Versailles)
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