The U.S. recently made some adjustments to its tariff policies. In addition to taking measures against China, Mexico and Canada, the U.S. imposed a 25-percent tariff on all steel and aluminum imports, sparking opposition from many sides. The new tariff measures mark another "major upgrade" of U.S. President Donald Trump's trade policy reform. Under the banner of "Make America Great Again," it is actually a strong blow to global trade relations.