Question: who were involved in the american civil war
[{'answer': 'United States', 'provenance': [{'wikipedia_id': '863', 'title': 'American Civil War', 'start_paragraph_id': 1, 'start_character': 81, 'end_paragraph_id': 1, 'end_character': 94, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Confederate States', 'provenance': [{'wikipedia_id': '863', 'title': 'American Civil War', 'start_paragraph_id': 1, 'start_character': 707, 'end_paragraph_id': 1, 'end_character': 725, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]