Question: when did the civil rights act of 1964 become a law
[{'answer': 'July 2 , 1964', 'provenance': [{'wikipedia_id': '188746', 'title': 'Civil Rights Act of 1964', 'start_paragraph_id': 26, 'start_character': 302, 'end_paragraph_id': 26, 'end_character': 315, 'bleu_score': 1.0, 'section': 'Section::::History.:Passage in the Senate.\n'}]}, {'provenance': [{'wikipedia_id': '188746', 'title': 'Civil Rights Act of 1964', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 320, 'bleu_score': 0.6476473807355441, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4391558574067082514}, 'section': 'Section::::Abstract.'}]}]