History can suggest to us alternatives that we would never otherwise consider. It can both warn and inspire. It can warn us that it is possible for a whole nation to be brainwashed, for “enlightened” and “educated” people to commit genocide, for a “democratic” country to maintain slavery, for oppressed to turn into oppressors, for “socialism” to be tyrannical and “liberalism” to be imperialist, for whole peoples to be led to war like sheep. It can also show us that apparently powerless underlings can defeat their rulers, that men (for at least moments of time) can live like brothers, that man can make incredible sacrifices on behalf of a cause.

Howard Zinn (1922-2010) American historian, academic, author, social activist

The Politics of History, ch. 17 (1970)