An old thread but interesting.Correct, some zeiss is US made meopta.
The new Leica's are made in USA by a third party, then shipped to Germany for QA, then shipped back. Sporting gear is all made in Portugal.
Swarovski is Swarovski of Austria however. The only non-sellout in the trio.
I could be mistaken but I thought Swarovski Z3 we’re assembled in America to keep costs down. But they still have great glass.