Question: when did the south surrendered in the civil war
[{'answer': '1865', 'provenance': [{'wikipedia_id': '21546927', 'title': 'Conclusion of the American Civil War', 'start_paragraph_id': 1, 'start_character': 135, 'end_paragraph_id': 1, 'end_character': 139, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '21546927', 'title': 'Conclusion of the American Civil War', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 329, 'bleu_score': 0.9611463610973231, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13807400159187981836}, 'section': 'Section::::Abstract.'}]}]