Question: where did maize cultivation begin in the americas
[{'answer': '9,000 years ago', 'provenance': [{'wikipedia_id': '20656228', 'title': 'Maize', 'start_paragraph_id': 7, 'start_character': 198, 'end_paragraph_id': 7, 'end_character': 213, 'bleu_score': 1.0, 'section': 'Section::::History.:Pre-Columbian development.\n'}]}, {'provenance': [{'wikipedia_id': '20656228', 'title': 'Maize', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 555, 'bleu_score': 0.9768747032089851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16479371893268689652}, 'section': 'Section::::History.:Pre-Columbian development.\n'}]}]