Question: when were house sparrows introduced to north america
[{'answer': 'mid-19th century', 'provenance': [{'wikipedia_id': '196147', 'title': 'House sparrow', 'start_paragraph_id': 46, 'start_character': 140, 'end_paragraph_id': 46, 'end_character': 156, 'bleu_score': 1.0, 'section': 'Section::::Distribution and habitat.\n'}]}, {'provenance': [{'wikipedia_id': '196147', 'title': 'House sparrow', 'start_paragraph_id': 46, 'start_character': 0, 'end_paragraph_id': 46, 'end_character': 739, 'bleu_score': 0.9832621206481431, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7029370108165881954}, 'section': 'Section::::Distribution and habitat.\n'}]}]