Question: when was niagara falls established as a national park
[{'answer': '1885', 'provenance': [{'wikipedia_id': '543509', 'title': 'Niagara Falls State Park', 'start_paragraph_id': 4, 'start_character': 481, 'end_paragraph_id': 4, 'end_character': 485, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '543509', 'title': 'Niagara Falls State Park', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 676, 'bleu_score': 0.982060959997838, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3337784271143700573}, 'section': 'Section::::History.\n'}]}]