Question: when did the war of 1812 officially end
[{'answer': 'February 18 , 1815', 'provenance': [{'wikipedia_id': '34059', 'title': 'War of 1812', 'start_paragraph_id': 190, 'start_character': 425, 'end_paragraph_id': 190, 'end_character': 443, 'bleu_score': 1.0, 'section': 'Section::::Memory and historiography.:American.\n'}]}]