After three years of indecisive but bloody war, guns lay silent in the Chaco Boreal in June 1935. Fifty years of bickering between Bolivia, a landlocked country seeking a river exit to the sea, and Paraguay, a land-hungry country seeking territorial aggrandizement and supposed mineral wealth, had culminated in open warfare in June 1932. By 1935 the antagonists, near exhaustion, finally agreed to discuss their differences.

Leslie B. Rout, Jr., examines three facets of the dispute and the inter-American peace conference that settled it. He analyzes the futile diplomatic efforts to...