Question: when was the last state added to the united states
[{'answer': 'Hawaii', 'provenance': [{'wikipedia_id': '497704', 'title': 'List of U.S. states by date of admission to the Union', 'start_paragraph_id': 18, 'start_character': 12, 'end_paragraph_id': 18, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::See also.\n'}]}]