The trench warfare. And the fact that both sides kept constantly sending more and more troops to the western front. So basically they go no where. If they try and advance there are machine guns and other artillary ready.
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stalemate
Both sides were too well matched. Neither side could gain a decisive advantage in gaining a forward thrust deep into enemy territory, without losing any advantage during the next counter-attack, and falling back to where they started from - resulting in stalemate.
The Western Front is generally considered a stalemate because of Trench Warfare. The line separating Allied Territory and Entente territory did not move much at all during the whole war. This is because both sides stayed in their trenches and if they advanced, they were pushed back quickly
In World War 1 Germany's western front was between Germany and France.French, British, and much later Americansoldiers fought German soldiers across this front.