What was the treaty of pairs?

A historian will ask you: Which one? There are somewhere around twenty five of them.

The one you are probably referring to is the 1783 Treaty of Paris, between the Congress of the Confederation (representing the United States) and the British Crown. This treaty formally ended the Revolutionary war in favour of the US. It was signed by John Adams, John Jay, Benjamin Franklin, and a representative of George III, David Hartley.