Question: when did segregation laws end in the united states
[{'answer': '1964', 'provenance': [{'wikipedia_id': '5441736', 'title': 'Racial segregation in the United States', 'start_paragraph_id': 3, 'start_character': 280, 'end_paragraph_id': 3, 'end_character': 284, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]