Question: when did it become a tradition to stand for the national anthem
[{'answer': '1942', 'provenance': [{'wikipedia_id': '31064', 'title': 'The Star-Spangled Banner', 'start_paragraph_id': 48, 'start_character': 140, 'end_paragraph_id': 48, 'end_character': 144, 'bleu_score': 1.0, 'section': 'Section::::Customs and federal law.\n'}]}, {'provenance': [{'wikipedia_id': '31064', 'title': 'The Star-Spangled Banner', 'start_paragraph_id': 48, 'start_character': 0, 'end_paragraph_id': 48, 'end_character': 1785, 'bleu_score': 0.9530452553079951, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16795544971940231074}, 'section': 'Section::::Customs and federal law.\n'}]}]