Question: when was the us founded as a country
[{'answer': '1776', 'provenance': [{'wikipedia_id': '3434750', 'title': 'United States', 'start_paragraph_id': 2, 'start_character': 435, 'end_paragraph_id': 2, 'end_character': 439, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '3434750', 'title': 'United States', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 741, 'bleu_score': 0.7485174491349531, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8947108751696055944}, 'section': 'Section::::Abstract.'}]}]