Question: what was a slave state that remained in the union called
[{'answer': 'Delaware', 'provenance': [{'wikipedia_id': '427798', 'title': 'Border states (American Civil War)', 'start_paragraph_id': 1, 'start_character': 440, 'end_paragraph_id': 1, 'end_character': 448, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Kentucky', 'provenance': [{'wikipedia_id': '427798', 'title': 'Border states (American Civil War)', 'start_paragraph_id': 3, 'start_character': 13, 'end_paragraph_id': 3, 'end_character': 21, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Maryland', 'provenance': [{'wikipedia_id': '427798', 'title': 'Border states (American Civil War)', 'start_paragraph_id': 1, 'start_character': 453, 'end_paragraph_id': 1, 'end_character': 461, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'answer': 'Missouri', 'provenance': [{'wikipedia_id': '427798', 'title': 'Border states (American Civil War)', 'start_paragraph_id': 3, 'start_character': 26, 'end_paragraph_id': 3, 'end_character': 34, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '427798', 'title': 'Border states (American Civil War)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 853, 'bleu_score': 0.9040662352602831, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14594635111991963766}, 'section': 'Section::::Abstract.'}]}]