Final answer:
Britain agreed to evacuate the northwest frontier posts, allowed U.S. trade in the West Indies, and settled colonial debts, but did not address impressment in Jay's Treaty.
Step-by-step explanation:
In Jay's Treaty, formally known as the Treaty of Amity, Commerce, and Navigation, Britain made several important concessions to the United States. The British promised to withdraw from the frontier forts in the Northwest and allowed American ships to trade freely in the West Indies. Additionally, the United States agreed to form a commission to address the issue of colonial debts that U.S. citizens owed to British merchants. Although it did not address the pressing issue of impressment, the success of Jay's Treaty encouraged Spain to enter into Pinckney's Treaty, granting Americans the right to navigate through the port of New Orleans, thereby aiding American commerce and settlement in the Ohio River Valley.