Should Republican presidential candidate Donald J. Trump deliver on his campaign promise to “build a wall” along the U.S.-Mexican border, he may want to leave a few openings for all the grain, dairy products and pork American farmers send to buyers to the south. The share of U.S. farm products destined for Mexico has grown as a stronger dollar eroded agricultural trade with former top buyer China, which devalued its currency, the yuan. This year, Canada will regain the top spot it lost in 2011, and Mexico will be tied for No. 2 with China, according to the U.S. Department of Agriculture’s latest forecast.

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