No matter where a speaker is assembled, the parts can come from other places.
Salk, for example, builds cabinets and assembles everything in the US, but the drivers come from many places: Acoustic Elegance (USA), SEAS (Norway), RAAL (Serbia), Accuton (Germany?), Aurum Cantus (China), LCY (China), Hiquphon (Denmark), Dayton (China).
The various parts for the crossovers probably come from China, Taiwan, and the US. And finally, the spiked feet Salk uses for their cabinets are made locally in Detroit.
It would be hard to find speakers where all the parts are made in the USA.