 In 1783, when the war came to an end, Britain ceded the entire trans-Allegheny region to the United States—including Indiana—under the terms of the Treaty of Paris.Clark's militia was under the authority of the Commonwealth of Virginia, although a Continental Flag was flown over Fort Sackville, which he renamed Fort Patrick Henry in honor of an American patriot.Later that year, the areas formerly known as Illinois Country and Ohio Country were organized as Illinois County, Virginia until the colony relinquished its control of the area to the U.S. government in 1784.