Question: when did the yukon become part of canada
[{'answer': '1870', 'provenance': [{'wikipedia_id': '34230', 'title': 'Yukon', 'start_paragraph_id': 19, 'start_character': 184, 'end_paragraph_id': 19, 'end_character': 188, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '34230', 'title': 'Yukon', 'start_paragraph_id': 32, 'start_character': 0, 'end_paragraph_id': 32, 'end_character': 304, 'bleu_score': 0.96188712955549, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3305014293687698841}, 'section': 'Section::::Economy.\n'}]}]