Question: when did cuba gain independence from the united states
[{'answer': 'May 20 , 1902', 'provenance': [{'wikipedia_id': '34348347', 'title': 'Republic of Cuba (1902–1959)', 'start_paragraph_id': 5, 'start_character': 240, 'end_paragraph_id': 5, 'end_character': 253, 'bleu_score': 1.0, 'section': 'Section::::Early independent governments.\n'}]}, {'provenance': [{'wikipedia_id': '34348347', 'title': 'Republic of Cuba (1902–1959)', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 503, 'bleu_score': 0.895108562830741, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 439952074798708707}, 'section': 'Section::::Early independent governments.\n'}]}]