Hannah Arendts penetrating observations on the modern world, based on a profound knowledge of the past, constitute a major contribution to political philosophy and to our understanding of the twentieth century. On Revolution is her classic analysis of a relatively recent political phenomenon. Here she looks at the principles which underlie all revolutions, starting with the first great examples in America and France, and showing how both the theory and practice of revolution have since developed. Finally, she foresees the changing relationship between war and revolution and crucial changes in international relations, with revolution becoming the key tactic.