Some of it is intentionally protectionist policies. As a country Canada can’t let the US dictate everything. If US milk becomes a necessity in Canada then that

Some of it is intentionally protectionist policies. As a country Canada can’t let the US dictate everything. If US milk becomes a necessity in Canada then that is one more way the US can exercise leverage over Canada. Given the last few years under Trump, I think some policies that insulate Canada from the nonsensical policies of an insane US president are quite responsible.