Introduction The United States is the world’s largest net importer of aluminum, with half of their imports coming from Canada. The U.S. consumes about five million tonnes of primary aluminum per year and some forecasts see that the United States could need up to 6.4 million tonnes per year by 2035. Background U.S. President Donald Trump issued a proclamation in February entitled “Adjusting Imports of Aluminum into The United States,“ increasing U.S. tariffs on aluminum imports to 25 per cent from 10 per cent, while citing national security concerns and excess global capacity. The decision applies to imports from Canada,…