How many ICs are actually made in the US? They're pretty mum about it. My guess is that none of them are made in the US. So the phone was assembled in the US from all kinds of parts.
It would be almost impossible to make a phone with parts that are entire manufactured in the US. Most silicon foundry work is done in Taiwan (TSMC, UMC, Vanguard) and S. Korea (Samsung, DB HiTek). See: https://www.cnbc.com/2021/03/16/2-charts-show-how-much-the-w...
However, if you are interested where the Librem 5 parts are made, see: https://source.puri.sm/Librem5/community-wiki/-/wikis/Freque...