Question: when did the colonies became the united states
[{'answer': '1776', 'provenance': [{'wikipedia_id': '34681', 'title': 'Thirteen Colonies', 'start_paragraph_id': 1, 'start_character': 247, 'end_paragraph_id': 1, 'end_character': 251, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '34681', 'title': 'Thirteen Colonies', 'start_paragraph_id': 1, 'start_character': 34, 'end_paragraph_id': 1, 'end_character': 552, 'bleu_score': 0.725643089913783, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9761928711756845159}, 'section': 'Section::::Abstract.'}]}]