And soybeans are just an easy example.
Add defense materiel to the list. Add a shitload of things to the list.
When Party A shows -- under a bright shining spotlight of its own making -- that it is an unreliable, erratic, mercurial, spiteful trading partner.....then parties B through Z will respond rationally, and pursue a strategy of disentanglement from trade with Party A to the largest extent possible.
Imagine that you are an HEB loyalist -- good store to shop at, wide selection, good prices, open pretty much all the time (yeah, HEB is open!). Then....HEB is acquired by new ownership. They start closing at random with little warning, so your plan to pick up your groceries this Saturday gets crushed. Then, when they ARE open, they close off random aisles, so you can't get your full list ("WTF? You closed off the coffee/tea aisle, and the dairy section? So now I have to go to another store for those?"). Also, they jacked up the prices on random items. The package of chicken breasts that was $7.50 last week is now $15, the package of toilet paper that was $10 is now $20. Again...when they're open. Oh, and the store manager walks behind you, insulting you and calling you a cheater and a liar the entire time you shop.
I'm gonna guess that you're going to check out the nearby Randall's, or Sprouts, or what have you rather quickly, because HEB sounds like it fucking sucks to do business with now.
And when it comes to things like large-scale commodities, supply chains, and long-term contracts (you don't buy a fifth generation fighter plane to use for a year, you buy it to use for 25 years), Party A is not going to get those sales back, for a generation or longer.
We are destroying ourselves as a global trading partner. For no fucking good reason at all. It's fucking insanity, the harm is massive and irreparable. And for fucking NOTHING. We're lighting ourselves on fire for fucking NOTHING.