Question: what led to the downfall of the incan empire
[{'answer': 'Battle of Cajamarca', 'provenance': [{'wikipedia_id': '1246225', 'title': 'Spanish conquest of Peru', 'start_paragraph_id': 1, 'start_character': 320, 'end_paragraph_id': 1, 'end_character': 339, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1246225', 'title': 'Spanish conquest of Peru', 'start_paragraph_id': 1, 'start_character': 29, 'end_paragraph_id': 1, 'end_character': 740, 'bleu_score': 0.8637077070953271, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16523621595949995456}, 'section': 'Section::::Abstract.'}]}]