What is northern border called and why?

The northern border of the United States is the longest international boundary between two countries in the world. It stretches for 5,525 miles (8,891 km) from the Atlantic Ocean in the east to the Pacific Ocean in the west.

The border was established by a series of treaties and agreements between the United States and Great Britain, beginning with the Treaty of Paris in 1783. The last major boundary adjustment occurred in 1846 with the signing of the Oregon Treaty.

The northern border is divided into two sections:

* The Eastern Section runs from the Atlantic Ocean to the Lake of the Woods in Minnesota. It follows the St. Croix River, the Pigeon River, and the 49th parallel north.

* The Western Section runs from the Lake of the Woods to the Pacific Ocean. It follows the 49th parallel north until it reaches the Rocky Mountains, then turns south along the Continental Divide.

The northern border is a busy transportation corridor. Millions of people and tons of goods cross the border each year by land, air, and sea.

The northern border is also a source of tension between the United States and Canada. There are a number of issues that the two countries have yet to resolve, including water disputes, fishing rights, and border security.

Despite these challenges, the northern border remains a symbol of cooperation between the United States and Canada. It is a reminder that the two countries share a long history and a commitment to democratic values.