If Zenith didn't sell out (for the most part) to LG until the third week of July 1995, I guess that makes my 19" Sentry 2 table model, which I got on July 9 of that year, one of the last sets ever manufactured by the company when it was still based in suburban Chicago (my set has a label on the back that says "Zenith Radio Corporation, Glenview, Illinois). I didn't see any references to Zenith subsidiaries in Mexico or anywhere else. Perhaps this explains why the TV still works as well as it does (with no repairs) after nearly 15 years, and why it still has its original CRT.
BTW, as I have said many times before, it is a crying shame that Zenith sold out to LG; after all, Zenith was the last American television manufacturer after Admiral, Magnavox, et al. left our shores for the Pacific Rim, and they really knew their business. I had several Zenith TVs that were made in the US, the first one being a 23" VHF-only model K2739 from 1963 that I found on a neighbor's treelawn in my hometown, circa 1969. Someone had filched all the tubes but the 1J3 HV rectifier when I found the set, but a new set of tubes got it working almost like new. My other Zenith TVs were a 1959 transformer-powered 19" portable (with a 5U4 rectifier tube), found at a rummage sale in the 1980s, a 1969 SC300 19" portable, "The Ventura", found on a treelawn in my old neighborhood in the mid-'70s, and a J121Y solid-state 12" portable that I bought new in 1978, after the '69 Ventura developed AGC problems (probably caused by a very gassy horizontal output tube--I couldn't find a replacement at the time).
My first new color TV, and the next one after it, were 13" Zenith color portables bought new in 1979 and 1982, respectively, but by now the sets were being made offshore. Actually, I think even my '78 Zenith solid-state b&w portable was made by a Mexican subsidiary of theirs, as I remember seeing a label on the back cover, above the vertical hold control IIRC, stating that the set had been manufactured in Mexico; might well have been Juarez, across the border from El Paso, Texas, but I'm not sure anymore.
My 14-year-old Zenith Sentry 2, as I said, may very well have been one of the last televisions ever made by the original Zenith Radio Corporation. When did the Glenview, Illinois plant close, if there ever was a production facility located there (might have been only for CRTs)?
From reading your post, it would seem that most of Zenith's operations had been moved to Mexico, and later offshore, by 1998 or thereabouts. I had a Zenith four-mode integrated stereo system, bought new in 1982, that had a notice printed on the back cover to the effect that the system had been built in Korea to the standards of the Zenith Radio Corporation; my 1980 Zenith H480 AM/FM stereo clock radio also has that notice stamped on the cover, so the company's radio and stereo plants must have left Chicago long before the TV division.
I had no idea, however, that Zenith's radio or TV production facilities were ever in Evansville, Indiana for any length of time; since Zenith was always headquartered in Chicago, I would have exprected anything the company made would have come from that area. I could have understood them having plants in Crown Point, LaPorte or St. John, Indiana (if such plants existed, which I know they did not--all of Zenith's operations in their glory days and until they sold out to LG were in Illinois suburbs of Chicago), as these are all northwestern Indiana suburbs of the city; but Evansville?