Question: when did arizona become a state in the us
[{'answer': 'February 14 , 1912', 'provenance': [{'wikipedia_id': '21883824', 'title': 'Arizona', 'start_paragraph_id': 22, 'start_character': 31, 'end_paragraph_id': 22, 'end_character': 49, 'bleu_score': 1.0, 'section': 'Section::::History.:20th century to present.\n'}]}]