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Which three countries were signatories of NAFTA?
北美自由贸易协定（NAFTA）的三个签署国是哪几个？
NAFTA was signed by Canada, Mexico and the United States in 1994.
北美自由贸易协定由加拿大、墨西哥和美国于1994年签署。后来被USMCA（美墨加协定）取代。
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