Question: when was columbus day made a national holiday
[{'answer': 'April 1934', 'provenance': [{'wikipedia_id': '121439', 'title': 'Columbus Day', 'start_paragraph_id': 6, 'start_character': 441, 'end_paragraph_id': 6, 'end_character': 451, 'bleu_score': 1.0, 'section': 'Section::::United States observance.:History.\n'}]}, {'provenance': [{'wikipedia_id': '121439', 'title': 'Columbus Day', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 671, 'bleu_score': 0.969009723555843, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12560276999848952282}, 'section': 'Section::::United States observance.:History.\n'}]}]