F**K YOU TAIWANESE/CHINESE MADE JUNK

Summit actually sells quite a few parts that are made in the USA, including under their Summit brand. They also list a “country of origin” right on the info page for the parts they sell, and most of their parts have a “made in the USA” icon right on the picture.

There are at least half a dozen thermostat housings for an LA engine that are made in the US listed on Summits website.

So the lowest bidder was you.

The castings in this case are (and the dies to create them) were more than likely made in China but in order to be able to list any part as "Made in the USA" it has to be finished and readied for sale in the US. For this housing that means the holes were likely drilled in the US and point-of-sale packaging was completed here. This a common "model" for importing parts and getting around the "Made in China" wording.