Signing of the Quinault Treaty: The Quinault and the Quileute cede their land to the United States.

The Quinault Treaty was a treaty agreement between the United States and the Native American Quinault and Quileute tribes located in the western Olympic Peninsula north of Grays Harbor, in the recently formed Washington Territory. The treaty was signed on 1 July 1855, at the Quinault River, and on 25 January 1856 at Olympia, the territorial capital. It was ratified by Congress on 8 March 1859, and proclaimed law on April 11, 1859.

The Quinault are a group of Native American peoples from western Washington in the United States. They are a Southwestern Coast Salish people and are enrolled in the federally recognized Quinault Tribe of the Quinault Reservation.

The Quileute are a Native American people in western Washington state in the United States, with 808 enrolled citizens in 2018. They are a federally recognized tribe: the Quileute Tribe of the Quileute Reservation.