Question: when did the final surrender of the civil war occur
[{'answer': 'April 9 , 1865', 'provenance': [{'wikipedia_id': '21546927', 'title': 'Conclusion of the American Civil War', 'start_paragraph_id': 61, 'start_character': 260, 'end_paragraph_id': 61, 'end_character': 274, 'bleu_score': 1.0, 'section': 'Section::::Surrender of CSS "Shenandoah" (November 6, 1865).\n'}]}, {'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': 4775795332020324082}, 'section': 'Section::::Abstract.'}]}]