Question: which countries were considered superpowers after world war ii
[{'answer': 'the United States', 'provenance': [{'wikipedia_id': '372836', 'title': 'Great power', 'start_paragraph_id': 24, 'start_character': 617, 'end_paragraph_id': 24, 'end_character': 634, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'the Soviet Union', 'provenance': [{'wikipedia_id': '372836', 'title': 'Great power', 'start_paragraph_id': 27, 'start_character': 540, 'end_paragraph_id': 27, 'end_character': 556, 'bleu_score': 1.0, 'section': 'Section::::History.:Great powers at war.\n'}]}, {'provenance': [{'wikipedia_id': '372836', 'title': 'Great power', 'start_paragraph_id': 29, 'start_character': 0, 'end_paragraph_id': 29, 'end_character': 824, 'bleu_score': 0.9676402440805071, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16160225340102856487}, 'section': 'Section::::History.:Great powers at war.\n'}]}]