Answer:
promised to evacuate the chain of forts in the Old Northwest
Step-by-step explanation:
Jay's Treaty is originally named the Treaty of Amity, Commerce, and Navigation, Between His Britannic Majesty and the United States of America.
The purpose of this agreement is to reduce as much as possible the tensions between Great Britain and the United States.
Part of the treaty is the British "promised to evacuate the chain of forts in the Old Northwest."
This is evident in the fact that the British eventually left the western forts in 1796.