If you are referring to the actual silicon, I don't believe that to be the case, at least according to WikiPedia (https://en.wikipedia.org/wiki/List_of_semicond

If you are referring to the actual silicon, I don't believe that to be the case, at least according to WikiPedia (https://en.wikipedia.org/wiki/List_of_semiconductor_fabrication_plants https://en.wikipedia.org/wiki/List_of_semiconductor_fabricat...) Many of the devices are assembled in China thus it's conceivable a backdoor may be installed at that time.