WildHorses ?
This caused me to think instantly of that " Are all Women Psycho " threadTake a look at males of any species. Have you noticed that there are always fights between them?Whereas the females only fight for two reasons. One being to protect their young. The other is over food.
So, If we got rid of most of the male species, keep only enough of them to be albe to have children. I think that would solve the war problem. No men, no fighting.