WASHINGTON — Hours after President Donald Trump signed executive orders implementing tariffs on goods from Canada, Mexico and China, the three countries slammed the move and promised retaliatory measures.

U.S. allies Canada and Mexico said that they would implement their own tariffs in response to Trump’s, a move that signals further economic upheaval among the close trading partners. China, a U.S. competitor, did not mention retaliatory tariffs or other specific measures but said it would…