Question: when was the american civil liberties union formed
[{'answer': '1920', 'provenance': [{'wikipedia_id': '1950', 'title': 'American Civil Liberties Union', 'start_paragraph_id': 5, 'start_character': 24, 'end_paragraph_id': 5, 'end_character': 28, 'bleu_score': 1.0, 'section': 'Section::::Overview.\n'}]}, {'provenance': [{'wikipedia_id': '1950', 'title': 'American Civil Liberties Union', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 1194, 'bleu_score': 0.960619370312871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2674119440906938790}, 'section': 'Section::::Overview.\n'}]}]