Which territory was claimed by both the U.S. and Britain, leading to joint occupation?

The Oregon Territory was claimed by both the United States and Britain, leading to a period of joint occupation through the Oregon Treaty of 1846. This territory, which was rich in natural resources and farmland, became a focal point for American expansionism as settlers moved westward in search of new opportunities. The joint occupation arrangement allowed citizens from both nations to settle in the territory, reflecting the tension and competition for land that characterized U.S.-British relations at the time. The eventual resolution of the claim through the Oregon Treaty underscored the United States' growing influence in the region and its commitment to Manifest Destiny.

In contrast, the California Territory, Texas Territory, and Nevada Territory were not subject to such a joint occupation arrangement and had different circumstances surrounding their claim and acquisition by the United States.