The 49th parallel refers to the line of latitude that serves as a boundary between the United States and Canada, particularly in regards to the Oregon Territory.
Related terms
Oregon Treaty: An agreement signed in 1846 between the United States and Britain that settled the boundary dispute over the Oregon Territory by establishing the 49th parallel as its northern limit.
Manifest Destiny: The belief prevalent in the 19th century among Americans that it was their destiny to expand across North America, including acquiring territory up to or beyond the Pacific Ocean.
Territorial Expansion: The act of acquiring new land or territories by a country through various means such as treaties, purchases, or conquests.