The Revised Revised AP U.S. History Standards by BarkerC

Question 9

Period 7: 1890-1945

Key Concept 7.3.II.B: "Although the [BLANK] [BLANK] Forces played
 a relatively limited role in combat, the U.S.’s entry helped to tip the balance of the conflict in favor of the Allies."

What is the formal name of the U.S. military forces, commanded by General John J. Pershing, whose name fills in the [BLANK] [BLANK] above?

American Expeditionary