You're missing the point. We CAN build computers. If the cost of computers from China goes thru the roof tomorrow because of the declining dollar, then we'll build our own, and we'll even export them and use the proceeds to buy whatever we want.
The main thing we can't do here is produce oil. That's one thing we'll have to buy from abroad. And it's the largest single component of the trade deficit, so it's gonna drag down the dollar.
If we want to strengthen the dollar, then the way to do it is to find ways to import less oil.
That is not the kind of thing which can be turned around on a dime. And that is precisely the situation of vulnerability to a severing of our supply lines that we should be more wary of. Especially as the old Communists Alliances with the Jihadists and Latin America gets rolling...
The main thing we can't do here is produce oil.
That is a matter of choice. Physically the Oil is here...and we CAN drill for it.