Question: when did the us first go into space
[{'answer': '1957', 'provenance': [{'wikipedia_id': '18896', 'title': 'Human spaceflight', 'start_paragraph_id': 7, 'start_character': 374, 'end_paragraph_id': 7, 'end_character': 378, 'bleu_score': 1.0, 'section': 'Section::::History.:Cold War era.\n'}]}, {'provenance': [{'wikipedia_id': '18896', 'title': 'Human spaceflight', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 1262, 'bleu_score': 0.9904073966945661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2251715710349174768}, 'section': 'Section::::History.:Cold War era.\n'}]}]