Steinway pianos
Kanstul brass instruments
Gibson (Nashville, TN, USA) Guitars
Heritage guitars (Kalamazoo, MI)
Fender (Fullerton, CA, USA) Guitars
Conn-Selmer Brass and Woodwind (Elkhart, IN, USA)
King brass instruments
Ken Smith Basses
Upton Basses (all or some?)
Rickenbacker guitars and basses
Martin (some) guitars
Engelhardt basses
Premium paisley bandana's from Tansclub (make great polishing cloths for any of the above instruments!)
CAD (some) tube condenser recording microphones
Acoustic Image amplifiers
Ampeg amplifiers
Peavey (some, but not all) amplifiers, guitars, basses, and sound systems
Glock pistols
Smith & Wesson Pistols
Derringer pistols
Springfield Rifles
If you want to play music or kill something, you can do either with a high quality American made product. 
I know there are still some great American made tools, particularly the hand tools;- check Highland Hardware for availability.