Michael Moynihan provides a historical measure for the fundamental concept of freedom. He reaches back through history to the primordial moment for freedom in the West: the flight of Jews from slavery in Egypt. He then traces an arc that takes the reader through ancient Athens and Rome, Runnymede in the 13th century, Philadelphia in 1787, through to the overthrow of the Raj, the collapse of the Berlin Wall, and up to the present. This engaging tour...