Question: when was the minimum wage established in the us
[{'answer': '1938', 'provenance': [{'wikipedia_id': '11477230', 'title': 'Minimum wage in the United States', 'start_paragraph_id': 11, 'start_character': 801, 'end_paragraph_id': 11, 'end_character': 805, 'bleu_score': 1.0, 'section': 'Section::::History.:New Deal.\n'}]}]