Question: the agreement to create a free-trade zone between the united states canada and mexico is called
[{'answer': 'North American Free Trade Agreement', 'provenance': [{'wikipedia_id': '22050', 'title': 'North American Free Trade Agreement', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 35, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22050', 'title': 'North American Free Trade Agreement', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 334, 'bleu_score': 0.6062264189630721, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 8038343875307635805}, 'section': 'Section::::Abstract.'}]}]