Question

what was an effect of the united states’ entry into world war i?

tensions developed between american and french troops over who would occupy the best trenches.

britain shifted most of its troops to the eastern front because they were no longer needed in france.

the arrival of fresh troops to the allied side forced germany to agree to a cease - fire within a year.

the ottoman empire immediately surrendered to the allied powers, realizing that its fight was futile.

Explanation:

• Analyze Option 1: There's no historical evidence of major tensions over trenches between American and French troops. So this is incorrect.
• Analyze Option 2: Britain's troops were mainly on the Western Front (in France) and the US entry didn't cause Britain to shift troops to the Eastern Front (which was mainly between Russia, Germany, Austria - Hungary etc., and Russia had already exited the war by then). So this is incorrect.
• Analyze Option 3: When the US entered WWI in 1917, it sent fresh troops and resources to the Allies. This boosted the Allied war effort, and by 1918, Germany, facing this new pressure along with other issues, agreed to a cease - fire (armistice) in November 1918, within about a year of US entry. This matches historical events.
• Analyze Option 4: The Ottoman Empire did not immediately surrender after US entry. It continued to fight until late 1918, and its surrender was due to a combination of factors including defeats in the Middle East and the overall collapse of the Central Powers, not just US entry. So this is incorrect.

Answer:

C. The arrival of fresh troops to the Allied side forced Germany to agree to a cease - fire within a year.