We haven't completely lost the ability to make things that make things and yes, there are machine shops in factories across the US. But how many of those machine shops have the equipment and expertise to completely produce the machines necessary to make a, for example, car, from carburetor to computer chips, without going outside the US. An increasingly large number of foundational products are being made in other countries and shipped here for assembly (and even that is being outsourced now).

Note: I should mention that I'm actually mostly OK with this - I don't have a huge issue with globalism. What I do have an issue with is people who claim this is a horrible, horrible situation while these same people are the ones who put us in this condition and continue to profit from it, without attempting to actually fix it, and expecting someone else to step up and fix it.