Question: when did the usa enter the vietnam war
[{'answer': 'November 1 , 1955'}, {'provenance': [{'wikipedia_id': '8453309', 'title': 'Role of the United States in the Vietnam War', 'start_paragraph_id': 30, 'start_character': 0, 'end_paragraph_id': 30, 'end_character': 260, 'bleu_score': 0.948006874591591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16832087494706817959}, 'section': 'Section::::Timeline.:Dwight D. Eisenhower (1953–61).\n'}]}]