Question: approximately how many treaties were made with tribes in the u.s
[{'answer': 'more than 500', 'provenance': [{'wikipedia_id': '704801', 'title': 'List of United States treaties', 'start_paragraph_id': 224, 'start_character': 61, 'end_paragraph_id': 224, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::U.S.–Native American treaties.\n'}]}, {'provenance': [{'wikipedia_id': '704801', 'title': 'List of United States treaties', 'start_paragraph_id': 224, 'start_character': 0, 'end_paragraph_id': 224, 'end_character': 545, 'bleu_score': 0.978375183951072, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2648470470352335905}, 'section': 'Section::::U.S.–Native American treaties.\n'}]}]