What agreements did the US make with Britain over expansion?

The United States and Britain made several agreements regarding territorial expansion, notably the Oregon Treaty of 1846, which settled the boundary dispute over the Oregon Territory. This treaty established the 49th parallel as the border between U.S. and British territories in the Pacific Northwest. Additionally, earlier agreements like the Treaty of 1818 allowed for joint occupation of the Oregon Territory, facilitating peaceful expansion until the resolution in 1846. These agreements underscored a cooperative approach to territorial disputes during a period of westward expansion in the U.S.