Question: when did the us start using electoral college
[{'answer': 'September 6 , 1787', 'provenance': [{'wikipedia_id': '85533', 'title': 'United States Electoral College', 'start_paragraph_id': 8, 'start_character': 97, 'end_paragraph_id': 8, 'end_character': 115, 'bleu_score': 1.0, 'section': 'Section::::Background.\n'}]}, {'provenance': [{'wikipedia_id': '85533', 'title': 'United States Electoral College', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 509, 'bleu_score': 0.9735040436119741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3996173319947040808}, 'section': 'Section::::Background.\n'}]}]