All complex human societies organized as states experience recurrent waves of political instability. The most common pattern is an alternation of integrative and disintegrative phases lasting for roughly a century. Integrative phases are characterized by internal peace, social stability, and relatively cooperative elites. Disintegrative phases are the opposite: social instability, breakdown of cooperation among the elites, and persistent outbreaks of political violence, such as rebellions, revolutions, and civil wars.
