My guess is that very few of us have much more than a slight clue as to how interwoven our cattle and beef production is between the USA, Canada, and even Mexico. It seems to be working quite well for all of us. Focus on improving inspections most likely is continuous. We do seem to forget that ranchers in Mexico have a very long history of selling yearling cattle to western USA ranchers who enjoyed that supply of low cost cattle compared with what 'eastern USA' calves would have cost them. AND those Mexico origin calves became profitable one or two year olds to sell into USA feedlots to finish, becoming very good beef! That worked well for many years, maybe still does, for all I know.
The feedlot and beef processing plants seem to have worked well with cross-border, CN and USA, serving needs of both sides making life easier for people and more efficient use of facilities processing cattle from both countries and using equivalent inspection rules.
It seems easy for some of us to forget that much of the US produced beef gets too fat getting to the high grades and we need some leaner beef to blend with that trim in order to cut waste and enhance leaner beef. It seems to be working quite well, and where improvements are needed, a fair guess is that those improvements will happen.
Finally, we as US citizens and cattle producers just may need all the friends we can get, given the world situation and the fact that we need customers for the great production of food so in excess of what the needs of our own people really are.
mrj