Question: when did the us send its first satellite into space
[{'answer': '31 January 1958', 'provenance': [{'wikipedia_id': '27683', 'title': 'Satellite', 'start_paragraph_id': 15, 'start_character': 401, 'end_paragraph_id': 15, 'end_character': 416, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}]