I strongly support buying local where possible, especially for agricultural and farming products. My general algorithm goes: buy in my local area -> city -> region -> state -> country -> western-aligned. I try to buy a lot of American made products in general because of that but even for things like dairy you can find high quality producers that, while more expensive, at least aren’t Big Dairy (for milk), whether that’s Canadian or American or otherwise.
It’s one thing for the government to create protectionist policies, it’s another to have folks like me or perhaps you who practice it in person with our daily economic choices.
In Canada Philadelphia is made from Canadian milk.
However i try to avoid ultra-transformed products like cheez-whiz and philadelphia. Those are not even allowed to be called "cheese" here, they must have some qualifier in front or after the word.
I have one rn in he fridge. It's "cream cheese product" because probably cannot put "cream cheese" in the name.
It's made from Canadian milk, not imported.
We have cows too, and farmers.