Question: when did the potato come to north america
[{'answer': '1719', 'provenance': [{'wikipedia_id': '36801884', 'title': 'History of the potato', 'start_paragraph_id': 31, 'start_character': 202, 'end_paragraph_id': 31, 'end_character': 206, 'bleu_score': 1.0, 'section': 'Section::::History by region.:North America.\n'}]}]