Question: when did halloween become a holiday in the us
[{'answer': '19th century', 'provenance': [{'wikipedia_id': '13855', 'title': 'Halloween', 'start_paragraph_id': 9, 'start_character': 738, 'end_paragraph_id': 9, 'end_character': 750, 'bleu_score': 1.0, 'section': 'Section::::History.:Gaelic and Welsh influence.\n'}]}, {'provenance': [{'wikipedia_id': '13855', 'title': 'Halloween', 'start_paragraph_id': 22, 'start_character': 0, 'end_paragraph_id': 22, 'end_character': 1066, 'bleu_score': 0.9880591662583851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7946803518939324024}, 'section': 'Section::::History.:Spread to North America.\n'}]}]