Question: the united states gained naval superiority in the pacific at the battle of
[{'answer': 'Midway', 'provenance': [{'wikipedia_id': '342641', 'title': 'Pacific War', 'start_paragraph_id': 38, 'start_character': 483, 'end_paragraph_id': 38, 'end_character': 489, 'bleu_score': 1.0, 'section': 'Section::::Historical background.:Japanese preparations.\n'}]}]