Humans are predisposed to form in-groups and out-groups that are remarkably flexible in their definition due largely to the complex language that has evolved in them. Language has allowed for the creation of shared “background stories” that can unite people who do not know each other. Second, the discovery of agriculture has resulted in the critical need to negotiate boundaries, a process that can lead to peace (but also war).

中文翻译：

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语言和农业如何促进文化和促进和平的规范

人类倾向于形成内群体和外群体，它们的定义非常灵活，这很大程度上是由于它们进化出了复杂的语言。语言允许创建共享的“背景故事”，可以将彼此不认识的人团结起来。其次，农业的发现导致迫切需要谈判边界，这一过程可以带来和平（但也可以带来战争）。