Question: when did the united states begin its revolution
[{'answer': 'April 1775', 'provenance': [{'wikipedia_id': '63876', 'title': 'History of the United States', 'start_paragraph_id': 70, 'start_character': 65, 'end_paragraph_id': 70, 'end_character': 75, 'bleu_score': 1.0, 'section': 'Section::::18th century.:Political integration and autonomy.\n'}]}, {'provenance': [{'wikipedia_id': '63876', 'title': 'History of the United States', 'start_paragraph_id': 70, 'start_character': 0, 'end_paragraph_id': 70, 'end_character': 158, 'bleu_score': 0.9214109120166031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6677774297908545950}, 'section': 'Section::::18th century.:Political integration and autonomy.\n'}]}]