Question: when did alberta become a province of canada
[{'answer': 'September 1 , 1905', 'provenance': [{'wikipedia_id': '1726029', 'title': 'History of Alberta', 'start_paragraph_id': 44, 'start_character': 305, 'end_paragraph_id': 44, 'end_character': 323, 'bleu_score': 1.0, 'section': 'Section::::Drive to provincehood.\n'}]}, {'provenance': [{'wikipedia_id': '1726029', 'title': 'History of Alberta', 'start_paragraph_id': 44, 'start_character': 0, 'end_paragraph_id': 44, 'end_character': 322, 'bleu_score': 0.905341140211783, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16920725276269999367}, 'section': 'Section::::Drive to provincehood.\n'}]}]