Question: when did the u.s. declare war on japan
[{'answer': 'December 8 , 1941', 'provenance': [{'wikipedia_id': '28047799', 'title': 'United States declaration of war on Japan', 'start_paragraph_id': 1, 'start_character': 3, 'end_paragraph_id': 1, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '28047799', 'title': 'United States declaration of war on Japan', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 801, 'bleu_score': 0.9028428060417921, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16845645149214104194}, 'section': 'Section::::Abstract.'}]}]