Zenith was quite successful, and was making TV sets in the US until the early 90's - but eventually the lower cost of overseas manufacturing caught up with them.
Motorola and Western are the saddest though, Motorola made everything, soup to nuts used in their products, and then bit by bit sold off the bits util they were left with two way radios (Motorola Solutions is the survivor of the original Motorola Inc). Western never really figured out divestiture, there are bits of pieces of it left, if anything Avaya is the closest to a spiritual successor to it (part numbering styles and engineering style).