The sticker on them say "Made in the USA"
Not to rain on everyone's parade, but sometimes this whole "Made In USA" is bullshit.
I used to work for a water valve company. We used to get cast and ductile iron castings from China. Being that there is a loophole in the laws, if we modified the casting in anyway on US soil, it could be branded as "Made In America/USA".
This included, but wasn't limited to buying non-machined and non-drilled raw castings and facing and drilling them here in the US.
The most disgusting example was when a customer wanted a US casting and I was instructed to grind China off the body and cover bonnets. Boom, made in the USA.
Technically, if this law were to apply to all resale item's, a board pressed in China could then be considered made in the US if the truck holes were drilled Stateside. Then again, two different industries, so I can't be sure.
Just something to ponder.