Counter-measures covering several sectors come after Trump announced 50% tariffs on Canadian goods

Canada’s retaliatory tariffs on billions of dollars’ worth of American imports have come into effect, escalating a trade fight that has been marked by intensifying tensions between US president Donald Trump and Canadian prime minister Mark Carney.

The tariffs took effect at 12.01am on Tuesday, and range from 15% to 50% and apply to products covering $20bn in imports from the US. The measures target sectors including steel, dairy, appliances, agricultural equipment, pulp and paper, and electronics – industries that have been most affected by US tariffs.