Question: when was the three branches of government created
[{'answer': '1787', 'provenance': [{'wikipedia_id': '28561', 'title': 'Separation of powers', 'start_paragraph_id': 18, 'start_character': 737, 'end_paragraph_id': 18, 'end_character': 741, 'bleu_score': 1.0, 'section': 'Section::::History.:Checks and balances.\n'}]}, {'provenance': [{'wikipedia_id': '28561', 'title': 'Separation of powers', 'start_paragraph_id': 18, 'start_character': 0, 'end_paragraph_id': 18, 'end_character': 782, 'bleu_score': 0.6301849438380821, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11813319318196249704}, 'section': 'Section::::History.:Checks and balances.\n'}]}]