Paradigm, B&W, and Dynaudio make their own drivers. I think all three are among the best!
My understanding is that B&W's Kevlar drivers are made in Asia (a least in 2005/6 they were). Don't know about Dynaudio, but if Paradigm made all of their own drivers I would be shocked. Never owned a pair or pulled one apart, but it would be a surprise to me if it were true.
Canton makes and engineers their own drivers in Germany. It's been awhile since I asked, but within the last two years Canton told me that they make and control everything in Germany. Not sure if that's still true or not, but that's what I was told by the President of Canton NA.
Phase Technology makes literally EVERYTHING in the USA themselves or within their parent company, MSE Audio Group. Even the voice coils in their crossovers are hand wound by Phase Tech/MSE employees here in the US. The cabinets, if I remember correctly are made in KC, MO by Induction Dynamics, another memebr of MSE
Phase Tech owns a lot of driver technology patents and OEMs drivers for a great many companies.
If anyone has info to refute my statment about B&W's Kevlar pieces, I would be interested in hearing it. Or, if Paradigm actually does OEM their own drivers that would be good to know as well.
If I can think of any more , I will add to the list!