If countries really want to get the US where it hurts, they only need to stop importing oil products from the US, corn, soybeans, and animal feeds. Food of any type, really, and any technology from an American company.
If you look at the number one export of the US for the last nearly 20 years, it's oil products. There are three primary sources for purchasing them: OPEC, Russia, and the US.
Canada chose to not purchase the whiskey. When I visited Canada recently (2 months ago), the streets were filled with nationalist signs and pro-Canada stuff that would be called Fascism if it were shown in the news for the US. I was told by my Canadian friends that this is a retort to the US. I said, "Well, I see you took the high road."