Question: joined mexico and the united states to form nafta
[{'answer': 'Canada'}, {'provenance': [{'wikipedia_id': '14526318', 'title': 'North American Union', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12061097134976414705}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '14526318', 'title': 'North American Union', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 795, 'bleu_score': 0.983672097934538, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12061097134976414705}, 'section': 'Section::::History.\n'}]}, {'provenance': [{'wikipedia_id': '58620732', 'title': 'United StatesMexicoCanada Agreement', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['United Mexican States, and Canada is a signed but not ratified free trade agreement between Canada, Mexico, and the United States. It is referred to differently by each signatoryin the United States, it is called the United StatesMexicoCanada Agreement (USMCA); in Canada, it is officially known as the CanadaUnited StatesMexico Agreement (CUSMA) in English (though generally referred to as "USMCA" in English-language Canadian media) and the Accord CanadaÉtats-UnisMexique (ACEUM) in French; and in Mexico, it is called the Tratado entre México, Estados Unidos y Canadá (T-MEC). The agreement is sometimes referred to as "New NAFTA" in reference to the previous trilateral agreement it is meant to supersede, the North American Free Trade Agreement (NAFTA). The Agreement is the result of a 20172018 renegotiation of NAFTA by its member states, which informally agreed to the terms on September 30, 2018', 'Canada', 'The Agreement between the United States of America, the United Mexican States, and Canada is a signed but not ratified free trade agreement between Canada,']}}]}]