The Age of Revolution. A series of political revolutions began in 1775 with the American Revolution and continued with the deeply influential French Revolution of 1789, and later lesser revolutions. Progress of the Human Mind, written by the Marquis of Condorcet, was imbued with a belief in the perfectability of mankind. (This in spite of the fact that its author was at the time in hiding from the leaders of the French Revolution.) The age of revolution, beginning with the American and French Revolutions, was marked by both faith in change and a longing to restore the past.