It accomplished absolutely nothing with China, while cementing them as the Eastern world power (and coming global world power). It has been profoundly Pyrrhic, like virtually all of Trump's "deals".

"the Canadian economy basically doesn't exist without US trade"

Canada's economy is absolutely integrated with the US, courtesy of trade agreements going back decades. A lot of that trade is reciprocal -- e.g. Alberta sends natural gas to the US, and Ontario imports natural gas from the US.

But to say it doesn't exist without US trade is simply ridiculous. One quarter of Canada's GDP is tied up in trade, a large portion of that involved with necessary minerals and raw goods, which will always have a market. Whether it's the US because it's convenient, or another country, it will be sold.

If all US trade stopped, Canada will be absolutely fine. There will be disruption, but it would almost certainly be beneficial in the long run.

Your last paragraph is just completely wrong. Mexico -- and the whole premise of NAFTA -- was to allow North America as a whole to compete better with Asia. Indeed, Trump's boasts about the trade agreements with Mexico are uproarious because at best they seriously hobble North American car makers against much cheaper foreign makers.