Depends on too many things to discuss, but here is the nuts and bolts.
Other than USO, NO US company uses 100% 'Merican parts. They merely assemble some things here. That said, even USO uses "Out of factory" parts, including raw glass at times.

Sort of like the bottle of "Ocean Spray 100% apple juice" I bought this morning. Reading the fine print we can see that "100% apple juice" also has "Other natural flavors and ingredients"...