Actually the free trade agreement between the US and Canada doesn't really worry me much since both countries do protect some industries, have free floating currencies, and both have simular laws in the area of worker protections. Where it bothers me is when a country with no worker protections, very restrictive protectionist policies, and no desire to float its currency enters into an agreement that suposedly is a free trade agreement. I would negate treaties that do not meet ony single criteria mentioned and would not ever consider a treaty of any kind in the area of trade that meets two or more of the three items I mentioned.

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The universe grows smaller every day and the threat of aggression by any group anywhere can no longer be tolerated. There must be security for all or no one is secure... - Klaatu