In the War of the Triple Alliance—the most terrible conflict in South American history—Paraguay was almost annihilated by the armed forces of Brazil, Argentina, and Uruguay. The chaotic postwar decade began with the Allied occupation of Asunción, which lasted seven years, and was marked by Brazilian-Argentine rivalry and interference in Paraguayan affairs and by the efforts of Paraguay’s governments to revive their stricken land, efforts often thwarted by corruption, factionalism, and revolutions. It ended with the arbitral award eliminating Argentina as a claimant to the Chaco Boreal and with the ascendancy of the Colorado Party, which dominated Paraguayan politics for most of the next century. This is the first book in any language that examines political, economic, and social developments to provide a well-integrated study of this significant and eventful period. It is based on archival resources, largely unused before, in England, the United States, Brazil, Argentina, and Paraguay, as well as on newspapers, books, pamphlets, and published documents in many libraries. As one historian has said, the study is “a masterpiece of sleuthing and historical synthesis.” It will be of interest not only to students of Paraguay but also to those concerned with Brazilian, Argentine, and Latin American history.