Question: when was harry potter first published in the us
[{'answer': '1 September 1998', 'provenance': [{'wikipedia_id': '2387806', 'title': 'Harry Potter', 'start_paragraph_id': 62, 'start_character': 194, 'end_paragraph_id': 62, 'end_character': 210, 'bleu_score': 1.0, 'section': 'Section::::Origins.:Publishing history.\n'}]}, {'provenance': [{'wikipedia_id': '2387806', 'title': 'Harry Potter', 'start_paragraph_id': 62, 'start_character': 0, 'end_paragraph_id': 62, 'end_character': 704, 'bleu_score': 0.9831208473513011, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8832092218947060315}, 'section': 'Section::::Origins.:Publishing history.\n'}]}]