I'm a little surprised everyone is mostly agreeing that he's doing this because he's stupid. I mean yes, he's a fucking idiot, but someone told him to start a blockade. And as we all know from the first one a week ago, it's only gonna jack up prices on literally everything even more than they are right now.
It's all a plan by the billionaire class that openly runs our country now to keep inflating prices so consumers don't have anything.
Edit: like c/BamboodPanda said, "Oil determines the price of shipping. Shipping determines the price of everything. They want to jack up everything."