The Paraguayan Civil War, also known as the War of the Triple Alliance, occurred 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 widespread devastation in Paraguay. The war resulted in significant loss of life and resources, with estimates suggesting that up to 90% of the male population in Paraguay perished. The aftermath left the country economically weakened and politically unstable, shaping its future for decades to come.