Question: before the spanish took over who owned the land that is now mexico
[{'answer': 'Aztec Empire', 'provenance': [{'wikipedia_id': '363176', 'title': 'History of Mexico City', 'start_paragraph_id': 6, 'start_character': 1004, 'end_paragraph_id': 6, 'end_character': 1016, 'bleu_score': 1.0, 'section': 'Section::::The Aztec city-state of Tenochtitlan.:Founding.\n'}]}, {'provenance': [{'wikipedia_id': '363176', 'title': 'History of Mexico City', 'start_paragraph_id': 14, 'start_character': 0, 'end_paragraph_id': 14, 'end_character': 569, 'bleu_score': 0.979054689945215, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5630639724510497926}, 'section': 'Section::::The Aztec city-state of Tenochtitlan.:Tenochtitlan at its height.\n'}]}]