(((Council on Foreign Relations)))' expert on geopolitics Peter (((Zeihan))) expects USA to withdraw from the global...

I think you may have missed the obvious threat here.

I'm not wasting my time with this video. Sorry, OP.

That doesn't do any sense. Even in a war scenario, the problems would be just higher prices to stuff we wouldn't be able to import because lack of money or availability. If rice or wheat gets expensive, we'd plant more of it, instead of just farming soy to feed European farm animals. Also, we live off food exporting and Argentina produces a shit ton of wheat already. Our neighbors in the Southern Cone are completely safe as far as I can tell.
Don't forget we also have our own navy and can easily ally with or hire anyone in the American Continent to protect our cargo ships.

He is talking about waterways that are in use, not waterways that are potentially navigable.