Question: when did mexico come under spanish colonial rule
[{'answer': '1521', 'provenance': [{'wikipedia_id': '19222', 'title': 'History of Mexico', 'start_paragraph_id': 3, 'start_character': 5, 'end_paragraph_id': 3, 'end_character': 9, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '19222', 'title': 'History of Mexico', 'start_paragraph_id': 3, 'start_character': 0, 'end_paragraph_id': 3, 'end_character': 781, 'bleu_score': 0.9643025203494101, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 5996482486999592785}, 'section': 'Section::::Abstract.'}]}]