Question: when were southern states readmitted to the union
[{'answer': "1868 - ' 70"}, {'provenance': [{'wikipedia_id': '4750567', 'title': 'Readmission of states', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 157, 'bleu_score': 0.7297349727547101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16712736422290428152}, 'section': 'Section::::Abstract.'}]}]