The Uruguayan Civil War occurred from 1839 to 1851, primarily between the Blancos and Colorados, two political factions in Uruguay. The conflict arose from power struggles and differing ideologies, with the Blancos advocating for rural interests and the Colorados supporting urban development and liberal reforms. The war saw significant battles and foreign intervention, including support from Argentina and Brazil. Ultimately, the conflict ended with the defeat of the Blancos, leading to a period of Colorado dominance in Uruguayan politics. The war had lasting effects on the country's political landscape and social structure.