Question: when did the erie canal started being built
[{'answer': 'July 4 , 1817', 'provenance': [{'wikipedia_id': '10046', 'title': 'Erie Canal', 'start_paragraph_id': 32, 'start_character': 19, 'end_paragraph_id': 32, 'end_character': 32, 'bleu_score': 1.0, 'section': 'Section::::Construction.\n'}]}]