I don't think any of my tools are made in the US, with the exception of the Shopsmith... almost all US tool companies have their stuff made in China or somewhere off shore...
My guess is on the higher quality brands, the precision is better on the off shore stuff because the tooling is a LOT newer...
My guess is that there is a world of difference (pun intended) in tools made in China and tools made China for a US tool company that supplies the specs and does some quality control..... Mac