Question: when did social security begin in the us
[{'answer': 'August 14 , 1935', 'provenance': [{'wikipedia_id': '35619800', 'title': 'History of Social Security in the United States', 'start_paragraph_id': 2, 'start_character': 36, 'end_paragraph_id': 2, 'end_character': 52, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '35619800', 'title': 'History of Social Security in the United States', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 560, 'bleu_score': 0.978606533029418, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1166933348127054940}, 'section': 'Section::::Abstract.'}]}]