The War of the Triple Alliance

The War of the Triple Alliance was an international military conflict in South America fought from 1864 to 1870 between Paraguay and the Triple Alliance of Argentina, Brazil, and Uruguay. With an estimated 400,000 deaths, it was the deadliest and bloodiest in Latin America's history. It particularly devastated Paraguay, which suffered catastrophic losses in population—some claim that almost 70% of its adult male population died—and was forced to cede territory to Argentina and Brazil.