Question: when did canada and the us become allies
[{'answer': 'World War II', 'provenance': [{'wikipedia_id': '5199', 'title': 'Canada–United States relations', 'start_paragraph_id': 2, 'start_character': 213, 'end_paragraph_id': 2, 'end_character': 225, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '5199', 'title': 'Canada–United States relations', 'start_paragraph_id': 105, 'start_character': 0, 'end_paragraph_id': 105, 'end_character': 449, 'bleu_score': 0.972407137066537, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14768515305555432262}, 'section': 'Section::::Military and security.\n'}]}]