In sharp contrast with previous researchers, Ilya Somin argues that the West's failure resulted not from constraints limiting the options of policymakers, but from ideological misconceptions, particularly those flowing from the "liberal" and "realist" theories of international politics. The liberal view, based on the right of national self-determination, was espoused by Woodrow Wilson, and David Lloyd George. While unsympathetic to Bolshevism, they remained wedded to preconceived ideas on revolution, intervention, and the efficacy of force. The realists thought that the opposing Whites might constitute a greater threat to Western interests; they discounted the role of ideology in Soviet foreign policy. Against these views, Somin sets the position of Winston Churchill, who repeatedly and unsuccessfully urged decisive action when the Soviet regime was militarily vulnerable. As a consequence of British and American policy failures, the entire course of European and world history was radically altered for the worse. also considers why earlier scholars, most notably George F. Kennan and William Appleman Williams, have ignored the issues raised here, even though they and others have not hesitated to criticize Western leaders for similar errors in other instances, especially in the case of Nazi Germany. Somin links the errors of 1918-20 to broader issues relating to the morality, feasibility, and desirability of Western, especially American, intervention in foreign civil conflicts. As a volume with important lessons for our own time, will be of interest to historians, political scientists, and foreign policy analysts.