Question: when did america become world's largest economy
[{'answer': 'since at least the 1890s', 'provenance': [{'wikipedia_id': '32022', 'title': 'Economy of the United States', 'start_paragraph_id': 2, 'start_character': 503, 'end_paragraph_id': 2, 'end_character': 527, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '32022', 'title': 'Economy of the United States', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1083, 'bleu_score': 0.961273104642794, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9425371812286978766}, 'section': 'Section::::Abstract.'}]}]