Much of the Michoud Assembly Facility's NASA history was focused on construction and production of NASA's External Tank (ET).
Silicon Valley is an area that located on the San Francisco, California, peninsula, radiates outward from Stanford University. It is contained by the San Francisco Bay on the east, the Santa Cruz Mountains on the west, and the Coast Range to the southeast.
They mostly located around where the innovation was taking place, in the Santa Clara Valley. From the 1970s till about now (the early 2010's), the capital of Silicon Valley, as I said earlier, is in and around the Stanford/Palo Alto/Menlo Park area.