Canada's retaliatory tariffs on the U.S. go into effect

Canada has imposed dollar-for-dollar retaliatory tariffs on U.S. goods totaling $20 billion, and they are now in effect.
The new counter-tariffs could raise prices on everyday products, affecting shoppers on both sides of the border.
The move escalates Canada–U.S. trade tensions and is being closely reported by NBC News (Monica Alba, Allie Canal).