United states and Britain
Rush bagot
Washington is a state in the United States.
Pacific Northwest of the United States
Pacific Northwest
A common type of conifer in the pacific northwest of the united states.
Washington is in the Pacific Northwest region of the United States.
Oregon and Washington comprise the Pacific Northwest region of the United States.
the pacific north west
Washington is a U.S. state in the Pacific Northwest region of the United States.
The United States and Britain agreed to occupy the Pacific Northwest together to avoid potential conflict over the region's valuable fur trade, establish trade relations with indigenous people, and maintain stability in the area during the 19th century. This agreement was known as the Oregon Treaty of 1846.
The question is not specific enough; which northwest coast is in question? If this refers to the United States northwest, the four countries that laid claims to it were: the United States, the United Kingdom, Spain, and Russia.