From Wikipedia about the second generation:
This version is based on the Nissan Patrol, the platform also used for the Infiniti QX80, as moving the Armada and Patrol to the same global platform instead of the Armada sharing the platform of the American-built Titan saves considerable development cost.[8] Apart from the Endurance V8 engine, which is assembled in Decherd, Tennessee, the vehicle is built in Japan.
Is it really US origin then?