Question: when was the usa's official poverty definition created
[{'answer': 'May 1965', 'provenance': [{'wikipedia_id': '19283913', 'title': 'Poverty in the United States', 'start_paragraph_id': 11, 'start_character': 656, 'end_paragraph_id': 11, 'end_character': 664, 'bleu_score': 1.0, 'section': 'Section::::Measures of poverty.:Two official measures of poverty.\n'}]}, {'provenance': [{'wikipedia_id': '19283913', 'title': 'Poverty in the United States', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 664, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6548914436841448458}, 'section': 'Section::::Measures of poverty.:Two official measures of poverty.\n'}]}]