Question: where did the oregon trail start and finish
[{'answer': 'Independence , Missouri', 'provenance': [{'wikipedia_id': '48711', 'title': 'Oregon Trail', 'start_paragraph_id': 80, 'start_character': 22, 'end_paragraph_id': 80, 'end_character': 45, 'bleu_score': 1.0, 'section': 'Section::::Routes.:Kansas.\n'}]}, {'answer': 'Oregon City , Oregon'}]