At which stage of fighting did the United States enter world war 1? A. Shortly after the beginning
B. beginning
C. years into the war
D. Too late to play an important role in the war

C

Explanation:

why does it need to be 20

C years into the war

Explanation:

The United States joined in 1917, while the war began in 1914, so a and b are incorrect, d is incorrect because if the USA had not sent the 4.7 MILLION troops that they did, the war might've been lost.

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