Question: who was the first us president to declare a national day of thanksgiving
[{'answer': 'President George Washington', 'provenance': [{'wikipedia_id': '8156749', 'title': 'National Thanksgiving Proclamation', 'start_paragraph_id': 1, 'start_character': 111, 'end_paragraph_id': 1, 'end_character': 138, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '8156749', 'title': 'National Thanksgiving Proclamation', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 218, 'bleu_score': 0.9364250605898111, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12412850282233332291}, 'section': 'Section::::Abstract.'}]}]