Farewell, Nafta, hello U.S.-Mexico-Canada Agreement. Here's how the renegotiated trade pact will impact U.S. supply chains.

The TransCore Link Logistics Canadian Freight Index fell behind in November, following its traditional drop this time of year, with volumes declining eight percent compared to October. While year-over-year volumes also dropped 28 percent, this is compared to historic highs set throughout 2014.

Total cargo shipments on the St. Lawrence Seaway have now surpassed 2013 levels despite one of the most difficult starts to the shipping season in years due to ice coverage. According to Seaway figures, total cargo tonnage from March 25 to August 31 reached 20 million metric tons, up 3 percent over the same period last year.

Daniel F. Lynch, director of international trade and transportation at Dalhousie University, reveals the importance of two-way trade between the U.S. and Canada - while offering a frank appraisal of the challenges that stand in the way of an ideal relationship.