A better example is that before our cognitive revolution humans could only really cooperate in groups no larger than 100. When we developed the ability to imagi

A better example is that before our cognitive revolution humans could only really cooperate in groups no larger than 100. When we developed the ability to imagine shared fictions, such as countries, money, law, religion, we gained the ability to cooperate on some level with every other human that also believed in those fictions. Money, even back when it was something like sea shells that were money, meant many disparate groups could cooperate as long as they shared the belief in the fiction of those shells being more than just shells.