Answer:
It is difficult to attribute the start of World War I to a single ideology as multiple factors contributed to the outbreak of the war. However, if we consider the major ideologies at play during that time, pacifism could be considered as an ideology that did not make a significant contribution to the start of the war.
Pacifism, which is the belief in peaceful resolution of conflicts, was not a dominant ideology in the major powers involved in the war. Rather, the dominant ideologies at the time were nationalism, imperialism, and militarism, which all played significant roles in escalating tensions and ultimately leading to the outbreak of the war.
Nationalism, which is the belief in the superiority of one's nation and the promotion of its interests, contributed to tensions between European powers, particularly in the Balkans. Imperialism, which is the policy of extending a country's power and influence through colonization, contributed to competition for colonies and resources, particularly in Africa. Militarism, which is the belief in the importance of military power and the glorification of war, contributed to the arms race and the buildup of military forces in Europe.
Therefore, pacifism, while an important ideology in promoting peace and nonviolence, did not play a significant role in the events leading up to the outbreak of World War I.