Question: why is ushuaia called the end of the world
[{'answer': 'southernmost city in the world', 'provenance': [{'wikipedia_id': '352107', 'title': 'Ushuaia', 'start_paragraph_id': 1, 'start_character': 137, 'end_paragraph_id': 1, 'end_character': 167, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '352107', 'title': 'Ushuaia', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 704, 'bleu_score': 0.8602071435057461, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7713838099068583485}, 'section': 'Section::::Abstract.'}]}]