A stalemate is a situation in which further action is blocked. A stalemate during World War I was broken in 1917 by
A.
American entry into the war.
B.
the use of chemical weapons.
C.
the invasion of Normandy.
D.
a significant German naval victory.

The entry of the United States was another turning point in World War I and history in general.
The isolationist policy established in the United States as early as 1823 implied interference with European affairs. Thus, the US remained neutral during the Great War, which brought them significant gains as European countries were buying huge quantities of goods, weapons and military equipment right here.
On the other hand, the defeat of the Entente brought business into question, as well as the repayment of debts that the US had previously towards the countries gathered in this alliance.
The trigger for US entry into the war was Germany's announcement that it would sign off on all ships supplying the army of the Entente States. After the sinking of a Lusitania passenger ship that killed a large number of American citizens was sunk in 1915, America enters the war against Germany on April 6, 1917.

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