How did the untied states’ decision to join the allies affect world war 1?

The correct answer is: the decision played a major role because the United States supplied thousands of men and supplies to aid in the Allied victory.

When the US joined the Allies, they sent around 10.000 men a day, and Germany couldn't replace their losses. So Americans helped the British Empire, French and Portuguese forces defeat Germany and had a major role in the final offensive.

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