The correct summary of the involvement of the United States in World War I would be:
"The U.S. joined the Allied forces in 1914, but did not send troops until 1917, which eventually forced Germany to surrender."
However, it’s important to clarify that the U.S. remained neutral for the first few years of the war and only formally joined the Allies in 1917. The involvement included sending troops, economic support, and resources, which contributed to the eventual defeat of Germany. Nonetheless, the phrasing in the response provided is misleading, as U.S. military involvement was not present in 1914 and did not commence until 1917.