Question: when were credit cards introduced in the us
[{'answer': 'September 1958', 'provenance': [{'wikipedia_id': '17182301', 'title': 'Credit card', 'start_paragraph_id': 24, 'start_character': 389, 'end_paragraph_id': 24, 'end_character': 403, 'bleu_score': 1.0, 'section': 'Section::::History.:BankAmericard and Master Charge.\n'}]}, {'provenance': [{'wikipedia_id': '17182301', 'title': 'Credit card', 'start_paragraph_id': 24, 'start_character': 0, 'end_paragraph_id': 24, 'end_character': 1390, 'bleu_score': 0.9915072387598121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 671333016619867569}, 'section': 'Section::::History.:BankAmericard and Master Charge.\n'}]}]