The statement that best analyzes the political role of the U.S. in World War I is:
"The U.S. had limited political impact, as European nations primarily chose to adopt American peace ideals that were useful to their own goals."
This analysis recognizes the significant influence of the U.S. in terms of resources and manpower, but underscores that the ultimate decisions made by European powers often reflected their own national interests rather than a complete alignment with American ideals.