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Archduke Franz Ferdinand of Austria was assassinated by a Serbian nationalist. Threats began to escelate and troops began to be mobilized, by August World War One was in full swing http://www.history.com/this-day-in-history/archduke-franz-ferdinand-assassinated
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the Lusitania was a British ocean liner that was sunk by a German U-Boat, who had hit the lusitania with a torpedo. the loss of American lives on the liner hastened U.S. involvement in WW1 http://history1900s.about.com/cs/worldwari/p/lusitania.htm
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The United States declares war http://www.thenagain.info/webchron/world/uswwi.html
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the selective Service Act authorized the government to raise a national army through conscription. http://www.history.com/this-day-in-history/us-congress-passes-selective-service-act
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At the Battle of Cantigny, American forces captured the German advance observation position, which was highly fortified. By capturing this outpost the Americans expanded their front by approximately a mile. http://www.firstworldwar.com/battles/cantigny.htm
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at the Battle of Saint-Mihiel, American forces caught german forces in the act of retreating. This was the first solo offensive by the USA in the First World War. http://www.historyofwar.org/articles/battles_st_mihiel.html
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The Treaty of Versailles officially ends World War 1
