Question: what year did the last veteran of the civil war die
[{'answer': '1956', 'provenance': [{'wikipedia_id': '489300', 'title': 'Albert Woolson', 'start_paragraph_id': 1, 'start_character': 52, 'end_paragraph_id': 1, 'end_character': 56, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '489300', 'title': 'Albert Woolson', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 444, 'bleu_score': 0.9304844600065421, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4166933285155044964}, 'section': 'Section::::Abstract.'}]}]