How have humans justified war throughout the 18th, 19th, and 20th centuries and how do developments in war and technology relate to this?

7000 word paper in MLA or Chicago Manual format, with footnotes.

How have humans justified war throughout the 18th, 19th, and 20th centuries and how do developments in war and technology relate to this?

• Use examples of wars throughout these centuries. Display military advancements during the time and how it changed war. Reveal how the changes in war changed the way wars are justified.
• use the writings of Just War Theory: writings of St. Augustine, St. Thomas Aquinas, Waltzer. The Just War Doctrine of the Catholic Church. The Art of War: Machievelli. Any other sources you feel necessary, internet or otherwise.