Robert M. La Follette (1855-1925), the Republican senator from Wisconsin, is best known as a key architect of American Progressivism and as a fiery advocate for liberal politics in the domestic sphere. But "Fighting Bob" did not immediately come to a progressive stance on foreign affairs. In The Education of an Anti-Imperialist, Richard Drake follows La Follette's growth as a critic of America's wars and the policies that led to them. He began...