Question: when did the federal government first adopt an income tax
[{'answer': 'briefly during the Civil War', 'provenance': [{'wikipedia_id': '12255114', 'title': 'History of taxation in the United States', 'start_paragraph_id': 1, 'start_character': 616, 'end_paragraph_id': 1, 'end_character': 644, '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': 700, 'bleu_score': 0.9513660363882591, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14286124959911211559}, 'section': 'Section::::Abstract.'}]}]