Question: where does the american southern accent come from
[{'answer': 'immigrants from the British Isles', 'provenance': [{'wikipedia_id': '627175', 'title': 'Southern American English', 'start_paragraph_id': 6, 'start_character': 50, 'end_paragraph_id': 6, 'end_character': 83, 'bleu_score': 1.0, 'section': 'Section::::Geography.\n'}]}, {'answer': 'the creole or post-creole speech of African slaves'}, {'provenance': [{'wikipedia_id': '627175', 'title': 'Southern American English', 'start_paragraph_id': 6, 'start_character': 0, 'end_paragraph_id': 6, 'end_character': 378, 'bleu_score': 0.7363835546705121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5813845559536101452}, 'section': 'Section::::Geography.\n'}]}]