It is possible to build a bike with no Asian made parts but not with strictly USA parts. I assume Zipp had their system made overseas? But if you add the EU both Campy and Rotor become options. Campy is Italian for the higher end stuff while the lower I believe is Romania. Rotor is, I believe, Germany and Spain. This exercise works real well with an all Euro bike.
Besides wheelsmith Marwi/Union spokes should be US made, velocity is firmly US made having moved from Australia, hubs have boundless options, really for track or bmx the tires might be the only issue.