There’s a fourth tool, which would never play in the US: supply management.
Industries like dairy tend to have boom-bust cycles of production and pricing. Canada uses supply management to smooth it out. The US uses massive subsidies, which keeps it cheap in the store, but results in huge surpluses that the US dairy lobby is always trying to find places to dump. (e.g. the US is insanely protective of its world-wide baby formula market.)
If Trump got in, He’d try another pork-brain attempt to “open up” the Canadian market.
