Question: when did the us become a representative democracy
[{'answer': '1787', 'provenance': [{'wikipedia_id': '52318', 'title': 'Representative democracy', 'start_paragraph_id': 14, 'start_character': 90, 'end_paragraph_id': 14, 'end_character': 94, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '52318', 'title': 'Representative democracy', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 813, 'bleu_score': 0.984789766484456, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11693836127771782150}, 'section': 'Section::::History.\n'}]}]