The Paraguayan War, also known as the War of the Triple Alliance, took place from 1864 to 1870. It involved Paraguay fighting against an alliance of Argentina, Brazil, and Uruguay. The conflict arose from territorial disputes and political tensions, leading to a devastating war that resulted in significant loss of life and resources. The war had a profound impact on Paraguay, which suffered immense casualties, with a large portion of its population killed or displaced. The aftermath left the country economically weakened and politically unstable, while the allied nations also faced challenges in the post-war period.