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Whatever the three countries (Mexico, Canada, U.S.A.) agree to put into the NAFTA treaty, will then probably be approved by the U.S. Congress... Which therefore becomes the Law for the United States. You know how it is: whatever the U.S. does is usually copied by many other countries. So... it is heads or tails... If they allow Bitcoin in NAFTA (and I don't know if they will, or not...) that will be a huge hurdle surpassed. If they make it illegal, that will cause a storm.

I think the sentiment is similar to Japan's: "let's regulate it, because we can't make it disappear."

I think crypto currencies will be accepted in the NAFTA talks. The Mexican Senate passed, by unanimous vote, to regulate electronic industry. The negotiator for Mexico in NAFTA talks has to know that this is the sentiment of the Senate, he will surely not try to forbid crypto currencies.