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  that a single terrorist act set off in chain
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  serbia set off a chain the alliance system
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  a large part of the german army would race west ,to defeat france
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  this was very important because the first battle of the marne was the most important event in war
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  Combatants
suffer devastating
losses
at battles of
Verdun and
the Somme. - 
  
  
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  they gambled that their naval blackade would starne britain into defeat befor the united states could mobilize
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  united states joinded the allies , the war had been going on for nearly three years
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  with the arrival two million american troops, the allied to began to duance steadily toward germay
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  in a reailway car in a forest near paris , the two singed an armistice , or an agreement to stop fighting.
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  the treaty of versailles between germant and the allied powers was singed in on june 28 five years to the day after franz ferdinand's assassination in sarajevo