The truth, as usual, lies somewhere in between. The pro-American camp conveniently chooses to overlook years of gallant fighting by the British, the French, the Russians and their assorted allies, not to mention the fact that the opening salvo of the Allies’ Grand Offensive — that eventually won the war in 1918 — began with the Battle of Amiens on August 8. On that date, armies composed primarily of British and Empire troops dealt the enemy such a blow that General Ludendorff himself called it “the black day of the German Army.”
As for the opposing school of thought, that the Yanks contributed but little to the Allied effort, I offer this historical evidence: On September 26, 1918, the Meuse-Argonne Offensive, a combined Franco-American effort that involved more than a million Doughboys, kicked off near Verdun, site of the war’s worst bloodletting two years earlier. In coordination with British and French gains further to the north and west, the Meuse-Argonne Offensive (which plays a pivotal role in my Great War novel Flower of Iowa) cemented Allied victory in the war, ending only with the Armistice of November 11.