how do you think World War I should be remembered? Was it a just or an unjust war? Why?

how do you think World War I should be remembered? Was it a just or an unjust war? Why? Response should address the physical and psychological effects that trench warfare had on soldiers, the new technologies of warfare, the use of Colonial troops, and the fact that, at least up to 1916 (for example, the Military Service Bill was introduced in January 1916 in the UK) most armies were made of volunteers.