Question: where did maize cultivation began in the americas
[{'answer': 'southern Mexico', 'provenance': [{'wikipedia_id': '20656228', 'title': 'Maize', 'start_paragraph_id': 1, 'start_character': 132, 'end_paragraph_id': 1, 'end_character': 147, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20656228', 'title': 'Maize', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 329, 'bleu_score': 0.803792703064062, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6630388662647640312}, 'section': 'Section::::Abstract.'}]}]