Final answer:
France provided the United States with military assistance during World War I.
Step-by-step explanation:
The European power that provided the United States with military assistance was France. During World War I, France and the United States were allies, and France provided military support to the U.S. in the form of troops and resources. One of the notable units that France assisted the U.S. with was the 369th Infantry, also known as the 'Harlem Hellfighters'.