Question: who were british allies that attacked settlements on the frontier
[{'answer': 'Native Americans', 'provenance': [{'wikipedia_id': '386555', 'title': 'American Indian Wars', 'start_paragraph_id': 75, 'start_character': 311, 'end_paragraph_id': 75, 'end_character': 327, 'bleu_score': 1.0, 'section': 'Section::::West of the Mississippi (1811–1924).:Great Plains.\n'}]}]