Given they share the world's longest land border, Canada and the US have historically enjoyed fruitful trade relations. But with Donald Trump escalating his tariff war, Canada is looking to the EU and further afield.

The move ratchets up the tensions in an increasingly bitter trade dispute between two of the world's closest economic partners.

President Donald Trump is invoking a 1930 trade law to impose whopping 50% tariffs on certain Canadian goods. The move threatens a broader trade war with the United States’…