Did the Vietnam war or the Civil war last longer?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q30', 'id': 0, 'label': 'United States of America'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q8740', 'id': 1, 'label': 'Vietnam War'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q8676', 'id': 2, 'label': 'American Civil War'}], 'links': [{'name_': 'P17', 'source': 0, 'target': 0, 'label': 'country'}, {'name_': 'P1344', 'source': 0, 'target': 1, 'label': 'participant in'}, {'name_': 'P793', 'source': 0, 'target': 2, 'label': 'significant event'}, {'name_': 'P710', 'source': 1, 'target': 0, 'label': 'participant'}]}