These differences are often small to start with, but they cumulate, creating a process of institutional drift. Just as two isolated populations of organisms will drift apart slowly in a process of genetic drift, because random genetic mutations cumulate, two otherwise similar societies will also slowly drift apart institutionally. Though, just like genetic drift, institutional drift has no predetermined path and does not even need to be cumulative; over centuries it can lead to perceptible, sometimes important differences. The differences created by institutional drift become especially consequential, because they influence how society reacts to changes in economic or political circumstances during critical junctures.
