Question: who built most of the mounds in mounds park
[{'answer': 'prehistoric Native American', 'provenance': [{'wikipedia_id': '6840342', 'title': 'Indian Mounds Park (Saint Paul, Minnesota)', 'start_paragraph_id': 1, 'start_character': 100, 'end_paragraph_id': 1, 'end_character': 127, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6840342', 'title': 'Indian Mounds Park (Saint Paul, Minnesota)', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 926, 'bleu_score': 0.9251708295660611, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 3861486198230428001}, 'section': 'Section::::Abstract.'}]}]