**I think it's definitely possible, we just need to keep working on growing ever-larger social groups, maybe even a global polity.** - Dr. Mike Martin, a Visiting War Studies Fellow at King’s College London, talks about [why we fight](https://www.youtube.com/watch?v=bs4JcvoCF1s). Morals and ideologies actually limit warfare, he thinks. A deeply shared sense of identity in the form of a large global group would probably do much the same. - Ultimately, Martin sees the trends of ever-decreasing violence and ever-increasing group size as correlated. - A large enough group could rid us entirely of warfare.

**Is it biologically ingrained within us to engage in war?** I don't think that inherent human aggression is to blame for war. In modern times where violence and killing are largely condemned, people need to be conscripted into fighting - suggesting that it's not an innate instinct. Wars between nation-states are [usually motivated] (https://owlcation.com/social-sciences/The-Main-Reasons-For-War#:~:text=Answer%3A%20There%20are%20many%20potential,or%20a%20perceived%20potential%20aggressor.) by political, religious, economic or ideological reasons. It was most likely the result of developing civilisations - where societies gained the abilities and motivations to enter into warfare. As [this article] (https://www.scientificamerican.com/article/war-is-not-part-of-human-nature/) (which is a really interesting read) says: "War is fostered by culturally specific systems of knowledge and values that generate powerful meanings of 'us versus them'. These social constructs have no primate analogies." So when we think about living in a post-war world, we aren't battling against our instinctive natures - rather we are battling against the ways our collective identities & social structures [have developed] (https://www.psychologytoday.com/gb/blog/finding-new-home/201908/the-psychology-us-vs-them). It is, then, theoretically possible for a world without war to exist in the future. As has already been commented here, maybe one of the most viable ways of this happening would be that some opposing force might bring the whole of humanity together. This could even be the humanity-wide threat of [global warming] (https://www.un.org/en/un75/climate-crisis-race-we-can-win) or something similar.