but then how american do you want your bike?
should the tubing be manufactured in the US too?
should the base materials be made in the US too?
should the components be made in the US too?
etc.
etc.
It would be all but impossible to have every material or component made in the US. If someone is looking for the All American Bike, I don't think it exist.
My bike's frame is made in California. The carbon tubes are made in the US too; but, many of the components are made in Italy.
However, the OP wanted a frame that was made in the US and that is very possible.