Question: when was the last time there was a war on american soil
[{'answer': '1945', 'provenance': [{'wikipedia_id': '7860372', 'title': 'List of attacks on U.S. territory', 'start_paragraph_id': 15, 'start_character': 49, 'end_paragraph_id': 15, 'end_character': 53, 'bleu_score': 1.0, 'section': 'Section::::Attacks on the U.S..\n'}]}]