Question: what brought the powhatan confederacy to an end
[{'answer': 'Treaty of Albany', 'provenance': [{'wikipedia_id': '511279', 'title': 'Powhatan', 'start_paragraph_id': 34, 'start_character': 131, 'end_paragraph_id': 34, 'end_character': 147, 'bleu_score': 1.0, 'section': 'Section::::History.:Anglo-Powhatan Wars and treaties.\n'}]}, {'provenance': [{'wikipedia_id': '511279', 'title': 'Powhatan', 'start_paragraph_id': 34, 'start_character': 0, 'end_paragraph_id': 34, 'end_character': 198, 'bleu_score': 0.9383861709333501, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11261168013886980931}, 'section': 'Section::::History.:Anglo-Powhatan Wars and treaties.\n'}]}]