6 avr. 1917 - US joins Allies
Description:
 - controversial, as many Americans believed in 
  neutrality or peaceful isolation
- before this they were economically involved in 
  the war; providing money, ammunition, and 
  supplies
- German subs began to target all merchant 
  ships, including those of neutral countries
- the sheer number of American reinforcements 
  soon caused the battle weary Germans to give  
  up 
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