Question: when did the american federation of labor start
[{'answer': 'December 8 , 1886', 'provenance': [{'wikipedia_id': '350020', 'title': 'American Federation of Labor', 'start_paragraph_id': 13, 'start_character': 230, 'end_paragraph_id': 13, 'end_character': 249, 'bleu_score': 1.0, 'section': 'Section::::Organizational history.:Formation and early years.\n'}]}, {'provenance': [{'wikipedia_id': '350020', 'title': 'American Federation of Labor', 'start_paragraph_id': 13, 'start_character': 0, 'end_paragraph_id': 13, 'end_character': 555, 'bleu_score': 0.9776501033621461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8806430968367505104}, 'section': 'Section::::Organizational history.:Formation and early years.\n'}]}]