Several centuries ago, the five nations that would become the Haudenosaunee--Mohawk, Oneida, Onondaga, Cayuga, and Seneca--were locked in generations-long cycles of bloodshed. When they established Kayanerenk wa, the Great Law of Peace, they not only resolved intractable conflicts, but also shaped a system of law and government that would maintain peace for generations to come. This law remains in place today in Haudenosaunee communities:...