Question: when did the black civil rights movement end
[{'answer': '1968', 'provenance': [{'wikipedia_id': '49001', 'title': 'Civil rights movement', 'start_paragraph_id': 1, 'start_character': 513, 'end_paragraph_id': 1, 'end_character': 517, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '49001', 'title': 'Civil rights movement', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 836, 'bleu_score': 0.676327139318823, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9084799911625927156}, 'section': 'Section::::Abstract.'}]}]