Gentlemen of the Senate:
You will perceive from the papers herewith delivered, and which are enumerated in the annexed list, that a difference subsists between Great Britain and the United States relative to the boundary line between eastern and their territories. A plan for deciding this difference was laid before the late Congress, and whether that or some other plan of a like kind would not now be eligible is submitted to your consideration.
In my opinion, it is desirable that all questions between this and other nations be speedily and amicably settled, and in this instance I think it advisable to postpone any negotiations on the subject until I shall be informed of the result of your deliberations and receive your advice as to the propositions most proper to be offered on the part of the United States.
As I am taking measures for learning the intentions of Great Britain respecting the further detention of our posts, etc., I am the more solicitous that the business now submitted to you may be prepared for negotiation as soon as the other important affairs which engage your attention will permit.
George Washington, Special Message Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/201153