Question: what brought great wealth and power to italian city states in the 14th century
[{'answer': 'trading', 'provenance': [{'wikipedia_id': '323758', 'title': 'Italian city-states', 'start_paragraph_id': 2, 'start_character': 574, 'end_paragraph_id': 2, 'end_character': 581, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '323758', 'title': 'Italian city-states', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 650, 'bleu_score': 0.928982429082958, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 2747643131165490074}, 'section': 'Section::::Abstract.'}]}]