Question: when was the line under god added to the pledge
[{'answer': 'Flag Day 1954'}, {'provenance': [{'wikipedia_id': '59581', 'title': 'Pledge of Allegiance', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 635, 'bleu_score': 0.815613161326689, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7019610529692730223}, 'section': 'Section::::Abstract.'}]}]