Question: when did alaska become a part of the united states
[{'answer': 'January 3 , 1959', 'provenance': [{'wikipedia_id': '624', 'title': 'Alaska', 'start_paragraph_id': 57, 'start_character': 553, 'end_paragraph_id': 57, 'end_character': 569, 'bleu_score': 1.0, 'section': 'Section::::History.:Statehood.\n'}]}]