Question: when was the grand canyon national park founded
[{'answer': 'February 26 , 1919', 'provenance': [{'wikipedia_id': '46986', 'title': 'Grand Canyon National Park', 'start_paragraph_id': 3, 'start_character': 60, 'end_paragraph_id': 3, 'end_character': 78, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '46986', 'title': 'Grand Canyon National Park', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 659, 'bleu_score': 0.9825310706027971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4421434708890937401}, 'section': 'Section::::History.\n'}]}]