A formal, usually written settlement between nations
In 1890-1893 its shores were divided by treaty between Great Britain, France and Germany.
The border issue was finally resolved by the Webster-Ashburton treaty of 1842.
In the treaty, language describing the border between the United States and Canada, still part of Great Britain, included this:
On the 17th of May 1517 the bishop of Dunkeld proceeded with Albany to France to conduct the negotiations which ended in the treaty of Rouen.
Germany, an ally of Austria-Hungary, was obligated by treaty to defend it.