The primary outcome of the American Revolutionary War for Britain was the loss of its thirteen American colonies, which became the United States of America. The war, lasting from 1775 to 1783, resulted in a significant shift in British colonial policy and global power dynamics. Following the Treaty of Paris in 1783, Britain faced challenges in reorienting its empire, losing economic resources and strategic influence in North America. The war also prompted Britain to reconsider its approach to other colonies, ultimately leading to changes in governance and colonial relations. This shift set the stage for future independence movements in other regions.