Question: when was the first native american boarding school opened
[{'answer': '1640', 'provenance': [{'wikipedia_id': '20087599', 'title': 'American Indian boarding schools', 'start_paragraph_id': 8, 'start_character': 363, 'end_paragraph_id': 8, 'end_character': 367, 'bleu_score': 1.0, 'section': 'Section::::Non-reservation boarding schools.\n'}]}, {'provenance': [{'wikipedia_id': '20087599', 'title': 'American Indian boarding schools', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 1262, 'bleu_score': 0.9793643865320981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18044746231199605644}, 'section': 'Section::::Non-reservation boarding schools.\n'}]}]