Question: when did the us institute an income tax
[{'answer': 'during the Civil War', 'provenance': [{'wikipedia_id': '12255114', 'title': 'History of taxation in the United States', 'start_paragraph_id': 1, 'start_character': 624, 'end_paragraph_id': 1, 'end_character': 644, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'the 1890s', 'provenance': [{'wikipedia_id': '12255114', 'title': 'History of taxation in the United States', 'start_paragraph_id': 1, 'start_character': 649, 'end_paragraph_id': 1, 'end_character': 658, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': '1913', 'provenance': [{'wikipedia_id': '12255114', 'title': 'History of taxation in the United States', 'start_paragraph_id': 1, 'start_character': 663, 'end_paragraph_id': 1, 'end_character': 667, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '12255114', 'title': 'History of taxation in the United States', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 738, 'bleu_score': 0.953519567724004, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12639964325606542379}, 'section': 'Section::::Abstract.'}]}]