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.
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We face extinction from an alien race. We all joint together to fight back. Afterward, we will realize how much we achieve together and there will be no going back to fighting each other.