Question: which is the most recent state to have joined the united states of america
[{'answer': 'Hawaii', 'provenance': [{'wikipedia_id': '6174697', 'title': 'Territorial evolution of the United States', 'start_paragraph_id': 3, 'start_character': 424, 'end_paragraph_id': 3, 'end_character': 430, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]