Trump’s tariffs on Mexico and Canada mark the first step; China and others to follow. The last big trade war was in 1930 at the start of the Great Depression.
The last significant trade conflict between the U.S. and Canada was indeed during the Great Depression in the 1930s. The Smoot-Hawley Tariff Act of 1930 led to increased tariffs on thousands of imported goods, which resulted in retaliatory tariffs from Canada and other countries, exacerbating the economic downturn. The last big trade war between the …