Question: when did the united states became a nation
[{'answer': 'July 4 , 1776', 'provenance': [{'wikipedia_id': '63876', 'title': 'History of the United States', 'start_paragraph_id': 78, 'start_character': 3, 'end_paragraph_id': 78, 'end_character': 20, 'bleu_score': 1.0, 'section': 'Section::::American Revolution.\n'}]}, {'answer': '1776', 'provenance': [{'wikipedia_id': '63876', 'title': 'History of the United States', 'start_paragraph_id': 2, 'start_character': 33, 'end_paragraph_id': 2, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'In 1776', 'provenance': [{'wikipedia_id': '63876', 'title': 'History of the United States', 'start_paragraph_id': 2, 'start_character': 30, 'end_paragraph_id': 2, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '63876', 'title': 'History of the United States', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 975, 'bleu_score': 0.921236315083064, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13227768238150664092}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '497704', 'title': 'List of U.S. states by date of admission to the Union', 'section': 'Section::::Abstract.', 'start_paragraph_id': 5, 'end_paragraph_id': 5, 'meta': {'evidence_span': ['Since the establishment of the United States in 1776, the number of states has expanded from the original 13 to 50.', 'Since the establishment of the United States in 1776, the number of states has expanded from the original 13 to 50.']}}]}, {'provenance': [{'wikipedia_id': '63876', 'title': 'History of the United States', 'section': 'Section::::Abstract.', 'start_paragraph_id': 2, 'end_paragraph_id': 2, 'meta': {'evidence_span': ['In 1776 in Philadelphia, the Second Continental Congress declared the independence of the colonies as the United States', 'n 1776 in Philadelphia, the Second Continental Congress declared the independence of the colonies as the United States']}}]}]