The internal parts of many of these are not USA made I would wager, at least for most of us. The caps in my Gibsons were not USA when I bought them. There were a lot of parts in my amps, from clips on up that were not USA even in my handmade amps. It is a continuum not an all or nothing thing really.
2002 Les Paul(USA) into Planet Waves Tuner (USA)>MXR Carbon Copy (USA)> Xotic BB Preamp (USA?)>Dr. Z Maz 18 (USA) into Marshall 1965B (England) also a Mixture of Monster, Planet Waves, Fender cables all USA. Back Up guitars Godin Freeway Classic (Canada\USA), Douglas T-Style(China), and a Mongrel Strat (Your guess is as good as mine)
Very little. Amps made in UK/Canada/China, cab made up here in Canada, speakers from US, guitars from japan/korea/mexico (one USA fender), pedals from all around the world except the US. I try for Canada first, USA/Japan/Denmark/Germany etc second, china if I have to I guess.