Answer:
The person that negotiated a peace treaty to avoid a costly war with Britain was John Jay.
Step-by-step explanation:
The Jay Treaty, also known as the London Treaty of 1794, was an international treaty between the United States and the Kingdom of Great Britain to resolve the differences between the two countries that had arisen as a result of the American War of Independence. The supporters of Jefferson did not like the treaty but it was approved by Congress and contributed to the formation of the first political parties. It was signed in the month of November 1794 and entered into force in 1795.
The treaty, in addition to avoiding the war between both nations, gave way to a decade of peaceful trade amid the convulsions produced in Europe as a result of the French Revolution.