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What best explains why the Central Powers were unable to defeat the Allied Powers once Russia was out of the war?
The Austro-Hungarian empire surrendered to the Allied Powers.
Italy joined the Allied Powers and opened up a new front in the east.
The Arabs defeated the Ottomans and advanced north into Austria-Hungary.
O The United States entered the war on the side of the Allies.

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Answer:

The United States entered the war on the side of the Allies.

I don't know for sure but I think its that one because I learned this last year.