Columbia War

The Columbia War (1852–1862) was an armed conflict fought between the kingdoms of Upper Columbia and Lower Columbia. Upper Columbia, which had been founded in 1799 after its founding king was deposed and exiled from Lower Columbia, began the conflict in 1852 by invading the Lower Columbian state of Nicholasia to its south. After a few years of success on the battlefield, Upper Columbia's fortunes were reversed, and by 1857, Lower Columbia had gained the upper hand. The war eventually ended in Upper Columbia's defeat and annexation into Lower Columbia, of which it remains a federal state to this day. The Columbia War was the longest war in which Lower Columbia has participated to date.