What was the most important factor to contribute to World War I? Explain

Difference in policies were to blame, although the immediate cause of World War one was the assassination of Austria's Archduke Franz Ferdinand. The war started mainly because of four aspects: Militarism, Alliances, Imperialism and Nationalism.

Explanation:

during the 1920s the goal of the united states was not letting business collide or go down or even compete this was due to wwl

i don't think it's c or d. i think it's either a or b.

hope this .