@Wretchard
Actually the stalemate breakers on the Western Front in France in 1918 was the arrival in great numbers of the American Army under Blackjack Pershing and probably the innovative tactics introduced by the brilliant Australian Lt General John Monash, an engineer by trade and a Jew (which made him an outsider amongst the British officer class at the time).
Pershing’s troops held more than 80 miles of the frontlines in 1918 and many other US Army divisions were fighting under French and Belgian Army command.
Quite simply, the rapidly increasing number of fresh US troops spelled the end for the Germans.
That and the fact that US industrial output in 1914 exceeded that of all the combatants on both sides combined.
The US would have swamped the Germans by mid 1919. The writing was on the wall, even for the pig headed Prussians.