Question: when did we start using the pledge of allegiance
[{'answer': 'June 22 , 1942', 'provenance': [{'wikipedia_id': '59581', 'title': 'Pledge of Allegiance', 'start_paragraph_id': 34, 'start_character': 629, 'end_paragraph_id': 34, 'end_character': 643, 'bleu_score': 1.0, 'section': 'Section::::Salute.\n'}]}, {'provenance': [{'wikipedia_id': '59581', 'title': 'Pledge of Allegiance', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 361, 'bleu_score': 0.9684940092844061, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14671806421442088706}, 'section': 'Section::::Changes.\n'}]}]