With the door slammed shut on them by their old allies, Native American resistance quickly collapsed. Delegates from the various confederation tribes, 1130 persons total, gathered for a peace conference at Fort Greene Ville in June 1795. The conference lasted for six weeks, resulting, on August 3, 1795, in the Treaty of Greenville between the assembled tribes and the "15 fires of the United States." Under its terms, the tribes ceded most of what is now Ohio for American settlement, recognized the United States (rather than Great Britain) as the ruling power in the region, and turned ten chiefs over to the U.S. government as hostages until all white prisoners were returned. This, along with the recently signed Jay Treaty, which provided for the British withdrawal from pre-Revolutionary War forts in the region it had not yet relinquished, solidified U.S. sovereignty over the Northwest Territory. Believing that the Natives were on the verge of extinction due to uncontrolled white settlement in protected lands, Washington and Knox sought to assimilate them into American society. In the Southwest, Washington pursued this policy of assimilation through treaties such as the Treaty of New York (1790) and the Treaty of Holston.