US, Canada, Mexico promise to strengthen economic ties
![US, Canada, Mexico promise to strengthen economic ties](http://www.reviewjournal.com/sites/default/files/field/media/31079603sfxl_6599950.jpg%3Fresize%3D750%3A500)
Canada, the United States and Mexico on Wednesday vowed to deepen their economic ties, pushing back against anti-free-trade sentiment that has shifted political debate in the United States and Europe.