By May Angel, Helen Reid and Jessica DiNapoli LONDON/NEW YORK (Reuters) -U.S. President Donald Trump's trade tariffs are meant to boost domestic manufacturing. But in the chocolate industry, they're doing the opposite: ramping up the cost of importing already-pricey cocoa and hurting the competitiveness of local factories versus Canadian and Mexican outfits that supply the U.

As the August 1 deadline for new tariffs looms, Canada and Mexico, two of the largest trading partners of the U.S., find themselves without exemptions. With President Trump's 'Liberation Day' strategy in full swing,