How would this happen? Through metal, fire, and chemical weapons? Through an event so horrible, so costly to life that all men were to come together as brothers?
EX: The war to end all wars
Or maybe peace? We see our own weaknesses and shortcomings in turn are willing to understand and accept those In others?
What about you flood? Thoughts?
Edit: No human nature shit. How YOU vision an end to war.
-
The only way for man to unite would be the introduction of a common enemy. Even then, that would only start a new, bloodier war. You cannot end war. It is in our very nature as aggressive creatures.