Latin America's Wars: The age of the professional soldier, 1900-2001. Introduction: What Were the Causes for War in Twentieth Century Latin America? ; Political Intervention by the United States ; An Early Twentieth Century Boundary Dispute ; Early Twentieth Century Interclass Revolution and Religious War ; An Extrahemispheric War ; Economic Interventions by the United States ; Interclass Struggles ; Major Boundary Disputes between the World Wars ; Mid Twentieth Century Intraclass Wars ; Another Extrahemispheric War ; Post World War II Intraclass Wars ; The Early Cold War Struggles ; Mid Twentieth Century Interclass Revolutions ; Early Cold War Intraclass Conflicts ; Cold War Border Disputes ; Late Cold War Intraclass Conflicts ; An Economic War