Shipping containers? Baja?  The first thing that pops into my head is Bush's scheme to allow Mexican truckers to drive throughout the US. Are these goods going to be imported into the US from Mexican ports using Mexican truck drivers? You've very correctly assessed the situation. Goods come into Mexico and then will be shipped northward, avoiding customs duty and the high wages of stevedores or whatever they're called. Will also be an easy way to get around inspection etc. and companies can write down smaller profit margins on paper (think a $3 pair of sneakers coming into Mexico from China, then being increased to $26, then sold in the States for $32. On paper, the seller only made a $4 profit and the money is neatly hidden away in Mexico where the US tax authorities can't get to it.)    NAFTA was the beginning of the end for America and Canada the moment it was signed.