The Treaty of 1855 was an agreement between the United States government and several Native American tribes in the Pacific Northwest, primarily the Treaty of Point Elliott. It aimed to establish peace and define land rights, allowing tribes to retain certain areas while ceding others to the U.S. government. The treaty also recognized the tribes' rights to fish and hunt in their traditional territories. The treaty was signed by representatives of the Duwamish, Suquamish, and other tribes, along with U.S. officials. It was part of a broader effort during the mid-19th century to manage relations between the U.S. and Native American nations as settlers moved westward.