Question: what needs to happen for puerto rico to become a state
[{'answer': 'congressional approval', 'provenance': [{'wikipedia_id': '475488', 'title': '51st state', 'start_paragraph_id': 2, 'start_character': 160, 'end_paragraph_id': 2, 'end_character': 182, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '475488', 'title': '51st state', 'start_paragraph_id': 2, 'start_character': 7, 'end_paragraph_id': 2, 'end_character': 347, 'bleu_score': 0.828417798589399, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12071290130992740997}, 'section': 'Section::::Abstract.'}]}]