Answer:
The effect of America joining the war was massive. America joining the war allowed for the Allies to win the war. With the Russian front closed, and the remaining might of the German Empire pressing against the western front, The Allies, as well as the axis, were exhausted. The economies of countries everywhere were suffering... except America. The ocean allowed for America to be isolated from the war. The American entry won the war
Explanation:
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The correct answer is : Twenty-First.
The Twenty-First amendment repealed the 18th amendment, which introduced the Prohibition (of alcoholic beverages in the US).
