Question: when did the usa formally recognize the people’s republic of china
[{'answer': 'January 1 , 1979', 'provenance': [{'wikipedia_id': '277880', 'title': 'China–United States relations', 'start_paragraph_id': 89, 'start_character': 76, 'end_paragraph_id': 89, 'end_character': 92, 'bleu_score': 1.0, 'section': "Section::::History.:The People's Republic of China and the United States.:Normalization.\n"}]}, {'provenance': [{'wikipedia_id': '277880', 'title': 'China–United States relations', 'start_paragraph_id': 87, 'start_character': 0, 'end_paragraph_id': 87, 'end_character': 1153, 'bleu_score': 0.9537143502925001, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10011506303347967395}, 'section': "Section::::History.:The People's Republic of China and the United States.:Liaison Office (1973–1978).\n"}]}]