Whole nations have transformed from warlike to peaceful societies.

Evidence

The strongest evidence against an innate trait of aggression is the transformation of entire nations from warring societies to pacific ones. The Swiss once were the main suppliers of mercenary fighters in Europe. After they transformed into a pacific society, they still maintain a standing army but deploy it for peacekeeping and lifesaving missions (Swiss Armed Forces, n.d.). Perhaps the most familiar aspect of their more militant past is the colorful uniforms of the Swiss-born Vatican guards. — Albert Bandura, Moral Disengagement, 176

Categorization

• SEED: An article on the Swiss and Swedish transitions as evidence for socially constructed peacefulness—and what institutions enabled the shift from mercenary-state to peacekeeper.
• XREF: Contradicts the popular ‘war is baked into human nature’ thesis (e.g. from evolutionary psychology pop-science books). — connects to: Durable peace requires transforming mindsets, not only weapons. — Miles Hewstone and Ed Cairns and Alberto Voci and Juergen Hamberger and Ulrike Niens, Intergroup Contact, Forgiveness, and…, 6