Every little helps. Perfect is the enemy of good and all.

Also there's a lot of food that's not necessarily grown or manufactured in the US but still goes into the pockets of American companies such as Mondelez, Coca-Cola, PepsiCo, Mars, Heinz, Kellogg's etc.

Not sure what American food the Danish buy in substantial quantities

Hopefully none now.

Probably food manufactured by US owned companies mainly. Although there was somewhat of an uptick in the sale of US beef several years ago, but I imagine prices would have ended that regardless of any boycot.

People don't just buy food.

I've eliminated more or less all US products and suppliers from my life; that was almost zero change to my food or drink purchases (I never did drink stuff like Coke.) But it has meant things like changing toothpaste, laundry conditioner, shower gel...

Alan a lot of brands that are thought of as traditionally European have American ownership.

They've spread their tentacles far and wide.

Same, one of those shit ass websites with bannerS and click here's and all that nonsense.