Question: who was the emperor of mexico who was overthrown in 1823
[{'answer': 'Agustín de Iturbide', 'provenance': [{'wikipedia_id': '601111', 'title': 'First Mexican Empire', 'start_paragraph_id': 2, 'start_character': 307, 'end_paragraph_id': 2, 'end_character': 326, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '601111', 'title': 'First Mexican Empire', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 359, 'bleu_score': 0.738378846737177, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 7803085569686471931}, 'section': 'Section::::Abstract.'}]}]