failed Central Powers. S choose to fight on the western front instead of address U-Boats. John Joseph "Black Jack" Pershing was the general in the United States Army who led the American Expedition Forces to victory over German in World War I. General John J. US general that led AEF forces during WWI. John "Black Jack" Pershing. american yawp ch wold war quiz the triple entente united all of the following nations except Army General John