The Forty-Ninth Parallel is a circle of latitude that is 49 degrees north of the equator. It serves as a significant boundary between the United States and Canada, stretching from the Atlantic Ocean in the east to the Pacific Ocean in the west. This line was established as part of the Oregon Treaty in 1846, which resolved territorial disputes between the two countries. The parallel passes through several U.S. states, including Montana, North Dakota, and Washington, as well as Canadian provinces like British Columbia and Alberta. It is notable for its geographical and political importance, marking a peaceful border between the two nations.