This is US News:

[The Conductor]

28. Most of this could be done now, simply with paperwork

Customs sealed and bonded railcars already pass between Canada and the U.S.. Since the goods are never unsealed or delivered in the U.S., there is no duty (or the duty is deferred). This can be done starting today, and has been part of the United States-Mexico-Canada Agreement negotiated and signed in 2018 by some idiot named "Donald Trump." Customs can inspect the cars and re-seal them, but with no goods destined for the U.S., so they have no ability to charge a penny of duty. Look at a rail map of North America and note how seamlessly the massive railroad CPKC (AKA Canadian Pacific Kansas City) connects across Canada and north south across the U.S. to run directly onto the rails of subsidiary Kansas City Southern de México. Container freight runs straight thru right now. The big changes advertised in the video would be the new bridge, plus diverting seaborn shipments that once went conveniently to U.S. ports to Mexico or Canada, cutting out the U.S. receiving the goods (or getting any part of them).

We are screwed, and the only thing needed is good paperwork.