I can see no indication on their site that any of their product has NA content.
If NA folks would stop buying cheap (low quality) product from China, China manufacturers would improve quality. It's not a Chicken-Egg thing. China is happy to sell to ignorant consumers. China makes lots of high quality stuff already.
I remember when I opened my package it said something about it being constructed in the united states. I assume the actual alloy parts were not, and it was simply assembled and welded here. You're right I couldn't find anything on their website after a quick glance, but they are definitely based in FL. More importantly, I don't respect the made in america obsession as much as other people [Im not implicating anyone, you yourself say quality would improve in china], although it's usually a motivator to buy something it's not intrinsically morally better or something. it's just often better quality, ect, not better ''because". Ok, rather than preach an annoyance at taking a (imo) misguided moral view on it (which really no one even told me, so I'm definetly preeching) I'll take a look and see if my pamphlet from the bike is somewhere home. If i don't find it, you can feel free to assume whatever, including that the bikes are not make in NA.
New to endless-sphere? Notice a lot of signatures recommending Ebike.ca? That's because it's the best place for a quality and manageable, (but still 'real'), first build. Justin is a solid supporter of electric bike development, and a good source of equipment.
My hat off a thousand times to the green people that effectively run this forum. The ES Mods are superb.