How did the battle of the marne expand the war beyond a regional struggle? the french were forced to use trench warfare.
the stalemate between german and french troops was ended.
the germans began to use poison gas as a weapon.
germany's plan for an easy french defeat was ruined.

world war i began in 1914, after the assassination of archduke franz ferdinand, and lasted until 1918. during the conflict, germany, austria-hungary, bulgaria and the ottoman empire (the central powers) fought against great britain, france, russia, italy, romania, japan and the united states (the allied powers). to new military technologies and the horrors of trench warfare, world war i saw unprecedented levels of carnage and destruction. by the time the war was over and the allied powers claimed victory, more than 16 million people—soldiers and civilians alike—were dead.

explanation:

i believe it was spain