Question: when did america gain independence from the british empire
[{'answer': '1783', 'provenance': [{'wikipedia_id': '1973', 'title': 'American Revolution', 'start_paragraph_id': 1, 'start_character': 78, 'end_paragraph_id': 1, 'end_character': 82, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1973', 'title': 'American Revolution', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 314, 'bleu_score': 0.5786226928988291, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16515998374950574886}, 'section': 'Section::::Abstract.'}]}]