Is there any OpenWrt compatible hardware that meets GAO Buy American Act?

maybe friendlyarm/elec instead then?

i have their Nano R4s but it is made in china.

however this is a pure router and you'd need a wifi AP to bundle with it.
(i personally use a AC-Lite as its miles better than my old SOC all in one router)

Its snapshot for OpenWrt atm but will be fully supported Soon (tm)