Question: when did reconstruction end after the civil war
[{'answer': '1877', 'provenance': [{'wikipedia_id': '55040', 'title': 'Reconstruction era', 'start_paragraph_id': 1, 'start_character': 84, 'end_paragraph_id': 1, 'end_character': 88, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]