Question: The Treaty of Fort Harmar was an agreement between the United States government and numerous Native American tribes with claims to what post-AMerican revolutionary War territory northwest of the River Ohio, and that legally existed from July 13 1787 until March 1, 1803?
{'answer': 'Northwest Territory', 'supporting_facts': [['Treaty of Fort Harmar', 0], ['Northwest Territory', 0], ['Northwest Territory', 1]]}