Proto Tools are made by the same company as Craftsman tools?
Where are Craftsman tools made?
Some tools are made in the US, others come from China, Taiwan, and Hong Kong it appears. Power tools are assembled in the US with foreign parts. You might find this website interesting:
https://allamericanreviews.com/stanley-black-decker/
Don't know who made Craftsman stuff post-1970, or so.
Prior to that, the major US toolmakers, like Stanley, Sargent, Millers Falls, Starrett, Brown&Sharpe, etc. made stuff for Sears with the Craftsman name on them. Most of it was great quality, but they had a second line branded as Dunlap which is generally crap.
Proto is now owned by Stanley, which merged with Black&Decker. Stanley hasn't made a good tool since they shuttered their UK manufacture several years ago.