What happened between 1763 and 1783 blank lost most of its land in the east?

Between 1763 and 1783, Great Britain lost most of its territorial claims in the eastern part of North America due to the American Revolutionary War. The conflict, which began in 1775, arose from colonial discontent with British rule and taxation. The war concluded with the Treaty of Paris in 1783, in which Britain recognized the independence of the United States, resulting in the loss of significant land east of the Mississippi River. This marked a major shift in territorial control in North America.