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By 1917, the countries fighting in World War I had reached a stalemate. A stalemate is a situation where no one can make progress. What happened in 1917 that ended the stalemate?

the invasion at Normandy

the use of mustard gas

the use of submarine warfare

the U.S entry into the war

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TheLazySquad

I do believe its The U.S entry of war, I hope this helps!!  :D

Study Island answer: The United States entry of war

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