Question: who wrote the significance of the frontier in american history
[{'answer': 'Frederick Jackson Turner', 'provenance': [{'wikipedia_id': '1821318', 'title': 'The Significance of the Frontier in American History', 'start_paragraph_id': 1, 'start_character': 100, 'end_paragraph_id': 1, 'end_character': 124, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1821318', 'title': 'The Significance of the Frontier in American History', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 649, 'bleu_score': 0.980097014099621, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9665836675289044502}, 'section': 'Section::::Abstract.'}]}]