Question: what started the war between us and japan
[{'answer': 'attack on Pearl Harbor', 'provenance': [{'wikipedia_id': '28047799', 'title': 'United States declaration of war on Japan', 'start_paragraph_id': 1, 'start_character': 126, 'end_paragraph_id': 1, 'end_character': 148, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': "that country 's surprise attack on Pearl Harbor the prior day"}, {'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': 0.8869456891679851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4204508641611367202}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2991012', 'title': 'JapanUnited States relations', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The countries maintained relatively cordial relations after that, and Japanese immigration to the United States was prominent until the 20th century, up until the 1930s, when Japanese actions during the Second Sino-Japanese War caused the United States to impose harsh sanctions against Japan, ultimately leading to the Japanese surprise attack against the US naval base at Pearl Harbor, opening the Pacific War theater of World War II.', 'Japanese surprise attack against the US naval base at Pearl Harbor,', 'The countries maintained relatively cordial relations after that, and Japanese immigration to the United States was prominent until the 20th century, up until the 1930s, when Japanese actions during the Second Sino-Japanese War caused the United States to impose harsh sanctions against Japan, ultimately leading to the Japanese surprise attack against the US naval base at Pearl Harbor, opening the Pacific War theater of World War II.']}}]}, {'provenance': [{'wikipedia_id': '14465303', 'title': 'Japanese declaration of war on the United States and the British Empire', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The declaration of war by the Empire of Japan on the United States and the British Empire was published on December 8, 1941 (Japan time; December 7 in the United States), after Japanese forces had executed an attack on the United States naval base at Pearl Harbor and attacks on British forces in Malaya, Singapore, and Hong Kong.', 'States), after Japanese forces had executed an attack on the United States naval base at Pearl Harbor and attacks on British forces in Malaya, Singapore, and', 'The declaration of war by the Empire of Japan on the United States and the British Empire was published on December 8, 1941 (Japan time; December 7 in the United States), after Japanese forces had executed an attack on the United States naval base at Pearl Harbor and attacks on British forces in Malaya, Singapore, and Hong Kong.']}}]}, {'provenance': [{'wikipedia_id': '28047799', 'title': 'United States declaration of war on Japan', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ["On December 8, 1941, the United States Congress declared war () on the Empire of Japan in response to that country's surprise attack on Pearl Harbor the prior day.", "On December 8, 1941, the United States Congress declared war () on the Empire of Japan in response to that country's surprise attack on Pearl Harbor the", "On December 8, 1941, the United States Congress declared war () on the Empire of Japan in response to that country's surprise attack on Pearl Harbor the prior day."]}}]}]