why did world war i transform western civilization so profoundly? group of answer choices as a global conflict between socialist nations and monarchies, the war signaled the ideological divisions of the twentieth century. the mass slaughter of world war i was hard to reconcile with the claim that western civilization was the triumph of reason and progress. because a vast majority of the victims were civilians, the war forever changed public perception of the acceptability of military conflict. the war generated an economic boom in europe and the united states that marked the beginning of the so-called roaring twenties.