The French were the main trading partners of the Choctaw before the Seven Years' War, and the British had established some trading. Trade deputes between the eastern and western division led to the Choctaw Civil War being fought between 1747 and 1750, with the pro-French eastern division emerging victorious. After Great Britain defeated France in the Seven Years' War, it ceded its territory east of the Mississippi River. From 1763 to 1781, Britain was the Choctaw main trading partner. With Spanish forces based in New Orleans in 1766, when they took over French territory west of the Mississippi, the Choctaw sometimes traded with them to the west. Spain declared war against Great Britain during the American Revolution in 1779.