Question: when did the us become allies with britain
[{'answer': 'during World War II', 'provenance': [{'wikipedia_id': '1814362', 'title': 'United Kingdom–United States relations', 'start_paragraph_id': 3, 'start_character': 154, 'end_paragraph_id': 3, 'end_character': 173, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1814362', 'title': 'United Kingdom–United States relations', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 345, 'bleu_score': 0.9645876452711911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5150310504066910301}, 'section': 'Section::::Abstract.'}]}]