The response that accurately summarizes the United States’ involvement and military role in World War I is:
The U.S. became involved in World War I after the Zimmermann Telegram and sent troops to provide military reinforcements and support.
This statement captures significant events leading to U.S. entry into the war, particularly the interception of the Zimmermann Telegram in early 1917, which urged Mexico to join the war against the United States and promised support for regaining lost territories. The U.S. subsequently declared war on Germany in April 1917 and began sending troops to support the Allied forces.