National flags are included in the list of tariffed items, which means that if Mark Carney standing up to Trump has you wanting to fly a Canadian flag, that flag probably just got more expensive.

What Canadian Goods Will Take Trump’s 50% Tariffs? Some Pretty Strange Items.
Buoys, dog muzzles, capes, national flags and “base metal statuettes” from Canada are now more expensive for U.S. shoppers.
nytimes.com