A treaty.
The Oregon Treaty of 1846 established the 49th parallel as the northern boundary between the United States and British North America (Canada), from the Rocky Mountains to the Strait of Georgia. This treaty resolved territorial disputes between the two countries in the Pacific Northwest.
In 1818, the two countries agreed to joint occupancy of the area west of the Rocky Mountains, which lasted until 1846, when the Oregon Treaty divided the lands along the 49th parallel.
An alliance or agreement between two countries :)
Spain and the United States wrote and signed this treaty.
The Treaty of Paris formally ended the American War for independence. The two countries that signed the Treaty of Paris were the United States and Great Britain.
A formal agreement between two countries is called a treaty or a pact.
Portugal and Spain signed the Treaty of Tordesillas, which had to do with newly found lands, and how the two countries would divide that land between them. Both countries ratified the treaty in 1494.
The two countries signed a peace treaty to end the conflict.
Oregon and Texas
it was Germany and England
russia and Spain