Is this realistic?

He claims that he wants to wall-off American from other countries. He's going to "renegotiate" trade deals with the rest of the world so that America comes FIRST. How many other nations do think are going to go for that deal?
So Trump is basically threatening to cut off trade with the outside world. Then he claims that he's going to reopen our coal mines, steel mills, and factories. All this as a PROMISE to Americans that he's going to bring high-paying jobs back to America.
But has anyone thought to question who's going to buy all this high-pri8sed Steel and manufactured goods? And who's going to burn all this high-priced coal?

We won't be able to export any of it because it will simply be too expensive. Why would other world countries when to buy our high-priced coal and steel when they can have their own far cheaper? Or buy from other countries far cheaper.
Americans will have to buy their own high-priced goods.
Also, what about the American Auto Industries? Will they then have to start buying high-priced American-made steel to make their cars with? If so, then the prices of cars will go up too.
Also, foreign car companies that have created jobs in America will no longer be permitted to import their steel either, because Trump is going to cut-off America from inexpensive foreign trade. So they will end up closing the doors to their car factories. And thousands of American employees will be in line at the unemployment office.
How does Trump think this is going to work? Economists have already pointed out that Trump's ideas are not realistic in today's global world. We can't just cut ourselves off from the rest of the world. We need to learn how to compete.
Trump's dreams are delusional yet people seem to be buying into this nonsense. They believe his outrageous claims. But how is that ever going to work?
If Trump cuts off trade with forging countries and Americans start making high-priced products that only a few Americans will be able to afford to buy, that's not going to work. American cars will become even more expensive than they already are.
Canada will need to build a wall to keep the disgruntled Americans from rushing into Canada as the American economy collapses under Trump's faulty delusions.
Why would anyone believe that Trump is going to be able to cut America off from world trade and that's going to actually work?
The rest of the world won't be interested in America's high-priced products, and Trump won't allow trade with the low cost nations. So Trump will have effectively cut America out of the the Global Economy.
How can anyone think that would work?
