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During President-elect Donald Trump’s first term, America launched an all-out trade war with China to boost US manufacturing, secure US national security interests and resolve what Trump believed was an extremely out-of-balance trade relationship.

The leaders of Mexico and Canada responded quickly, and in different ways. Justin Trudeau, Canada’s prime minister, jumped on the phone to Mr Trump to chat about the “intense and effective connections” between their countries. His deputy, Chrystia Freeland, released a statement about the importance of border security.