Military History

In 1863 and 1864, historical and political contradictions in the River Plate region led to civil war in Uruguay, creating tensions with neighboring nations in the region. The Brazilian government intervened both politically and militarily in Uruguay to address the interests of ranchers in its province of Rio Grande do Sul, to distract the attention of the Brazilian citizens from domestic problems, and to preserve the political influence of the Empire of Brazil on Uruguay. This action by the Empire clashed with the new Paraguayan policy of political interference in the River Plate region and resulted in the declaration of war against Brazil by Paraguayan dictator Francisco Solano López. This conflict broadened into the Paraguayan War.

The English-speaking world awaits its first detailed study examining Latin America during World War I. Many historical events of the era remain little-known, as does much of the region’s military history during this period. While key chronologies, personalities, groups, and historical avenues remain unidentified, researchers must draw knowledge from existing texts. The authors cited in this article for further study cover only a small fraction of the myriad topics presented by the war.

World War I set in motion a unique power readjustment in Latin America, the likes of which had not been experienced in the region since the 1820s. Most significantly, the temporary suspension of economic ties with Europe disrupted everyday processes that elites and commoners had previously taken for granted. Changes in economy and finance triggered a struggle between indigenous Americans, peasants, workers, elites, and immigrants, setting the stage for the social and political changes of the 1920s. Amidst the upheaval of World War I, non-elite Latin American groups successfully focused national politics on regional and ethnic issues, while elite Latin Americans weighed the potential advantages of ties with Spanish and Italian authoritarianism. World War I ended European financial dominance over the region, and the destruction of Europe reduced export markets to a point where Latin America’s economic relations with the United States gained new significance. U.S. military advisors took their places alongside European trainers, and many different “U.S.” actors emerged on Latin American soil, acting out rivaling understandings of appropriate U.S. activity in Latin America. The war heralded the end of Belgian influence and of significant French power in the region, British acceptance of U.S. financial preeminence, and questions as to how Prussian military expertise could be leveraged to Latin America’s benefit in the future. The creation of the League of Nations, a development alien to Latin American political culture, caught the region off guard. And yet it laid the foundation for global Latin American diplomacy in the 1930s and after World War II. In the end, the search for a new understanding of a Latin American nation’s place on the changing world stage led to the elevation of the institution of the national army as a social and political arbiter. The myth of the army as embodiment of national essence would last until the 1980s.

The Mexican-American War ranks among the most consequential events in the history of both nations. Although the casus belli for the United States’s May 12, 1846, declaration of war was the Mexican ambush of a U.S. Army patrol in the disputed Nueces Strip on April 25 of that year, two underlying causes rendered conflict inevitable. The dispute over Texas was the first, and the desire of both nations to control the Mexican provinces of Nuevo Mexico and California was the second. President James Knox Polk identified the acquisition of that territory as the principal objective of his administration.

The conflict also remains noteworthy for the extent to which the political milieu in both countries proved as important as events on the battlefields. In México, a devastating war of independence (1810–1821), multiple violent overthrows of the federal government, the failure of two constitutions to produce a structure acceptable to both conservatives and liberals, and enmities generated by the socioeconomic structure severely limited México’s growth, tranquility, and potential for armed resistance to an invader. In the United States, the national unity evident at the outbreak of the war faded in the face of sectional rivalries, unexpectedly high casualties, and declining relations between the executive and legislative branches.

The military phases of the war fall into two segments. In the first, forces considerably smaller than those deployed in later phases of the war fought in Texas and in the Mexican provinces of Nuevo Mexico, California, Tamaulipas, and Nuevo Leon. When United States victories in northern Mexico failed to produce the anticipated Mexican surrender, the second phase of the conflict began on March 9, 1847, with General Winfield Scott’s invasion of central Mexico and ended with his entrance in Mexico City on September 14, 1847.

In the following seven months, both governments sought to obtain the best terms. A rising tide of violent rural rebellion in Mexico and a rising tide of Whig opposition to the Polk administration in Washington served as catalysts during the negotiations. Two agreements, the February 2, 1848, Treaty of Guadalupe-Hidalgo and the March 6, 1848, Truce Agreement brought hostilities a close.

Consequences of the conflict included the Mexico’s loss of 525,000 square miles of territory, the emergence of the United States as the dominant continental power, the dispossession of many Mexican citizens living in what had become U.S. territory, and the reestablishment of Mexican sovereignty over territories in rebellion.

In the period 1870–1936, Paraguay began to redevelop economically after its devastating loss in the War of the Triple Alliance (1864–1870). Turning to a liberal economic model popular in the region at the time, government officials began selling off large tracts of land to foreign investors, in particular Argentine investors. The liberal era in Paraguay was notoriously turbulent as political rivals often relied on Civil War to gain power. Nonetheless, this period was pivotal in helping to shape ideas about the nation. The era ends at the Febrerista Revolution (1936) when returning Chaco War (1932–1935) veterans made their mark on Paraguayan politics and identity.

The effort of searching the effects of the War of the Triple Alliance against Paraguay on the building up of Brazilian national identity challenges the historian with a paradox: why the military victory promotes the fall of the political regime instead of strengthening it. The article tries to deal with some dimensions of this paradox underlining the distinctive characteristics of this war in the ongoing warmongering in the Platine region—the huge numbers of conscripted soldiers (“the Total War”), the hybrid political character of the alliance (Brazilian monarchy and Argentinian Republic), the opposition of most of the conservative classes, and the unveiling of slavery as a strategic weakness for the country—are some of the themes treated in order to explain how the empire lost both the battle of worldwide moral support and the battle of legitimacy inside the country. The massive recruitment coming from all parts of the country could bring the empowerment of ordinary people in the postwar decades, but the monarchical elites took careful steps to ensure that these sectors were quickly demobilized and also not to receive medals and other military honors. The postwar era was one of unfolding of an endemic crisis leading to contest of monarchical institutions. They came from military sectors, but also from regional elites, besides bitter criticism from middle-class intellectuals. Racial arguments filled an outstanding part in this period, leading to the giving prestige of “scientific” racism and the negative diagnosis for the future of a modern nation founded in a racially mixed society.