Mexico and Canada both have trade deals with the EU, so that should give you some indication as to which NAFTA partner might be the sticking point. Apart from that, even NAFTA isn't true free trade there are a ton of negotiated exceptions that took a long time to hammer out ( see current negotiations). read more
Apart from that, even NAFTA isn't true free trade there are a ton of negotiated exceptions that took a long time to hammer out ( see current negotiations). Undertaking these negotiations between two unwieldy trade blocs would be a very complex undertaking that would likely take years and have to survive changes of government in a slew of countries. read more
The North American Free Trade Agreement (NAFTA) is an example of this economic cooperation. Customs union. This type of association provides economic cooperation like a free-trade zone. Barriers to trade are removed between member countries. read more
EU is a separate opinionated body through European Parliament whereas NAFTA is presently a contract to promote trade amongst member countries. Numerous countries of EU have several clashes between them but members of NAFTA were not opponents with each other. read more