Anyone who honestly thinks that Fender and EB are gouging on their US made instruments is uneducated about what it takes to manufacture and sell a product.
Here's a thumbnail of how it works:
You need manufacturing and office space.
Grab a newspaper and see what 20,000sf of warehouse space will cost you a month. Then heat and light it and make it secure.
You need machinery and tools.
Go price just CNC milling machines and water cutters. Then pay the upkeep and monthly electricity bill.
CNC machines are useless without computers and software. The industry standard Solidworks/Camworks is going to cost you $60K+ per seat even on a multi-seat licence.
You need skilled people to maintain and run those CNC machines then assemble what they spit out. It's not rocket science but it's not minimum wage either. And that's North American wages...with benefits if you want to keep anyone good.
You need materials and a staff to source them.
Good quality traditional wood is getting more expensive and harder to find. A large company needs a team of very knowledgeable people to keep a regular flow of materiel coming in...and not just wood. You need people who can source fasteners, fabrics, metal, electronics, rubber and plastics.
You need office staff to answer phones, administer purchase orders, do payroll, keep accounts. You need chairs and desks and computers and printers and office supplies for them.
You need an advertising staff and budget.
You need an external sales distribution network that gets a cut.
Packaging and shipping costs.
Then the retailer gets their cut.
It's also worth considering that companies like these need to come up with improvements and new designs. This takes people, tools and work space, computers and software and materiel to play with. The money spent on R&D is only recovered in the long term so the immediate costs are born by the products you're selling now.
Do the math.
A new Stingray or US P-Bass is almost certainly hanging on the wall at GC for as cheap as it can be done and still keep the machine that made it fed.