Forgings are all done pretty much done in China and Japan. A forging can be a very raw product require a lot of hands on work to be turned into a finished club. That work can be done in the US in which case the final product can have a lot of the final value and workmanship coming form the US. Or the forging can be fairly finished and require little value add to get it to market. Or the finish work can be done abroad. Or the finishing work and assembly can be done abroad. It depends on the manufacturer and the club etc as to the specifics. Nike for example did a ton of handwork (on their tour clubs at least) in Ft Worth, but that of course is now over.
The shafts are not made by the club company but bought from shaft manufacturers. True Temper has huge market share in steel shafts and is USA made. In graphite most production is China and Japan. So it depends on what the manufacturer provides and the customer demands. There are some grips made in the US but most of the big names produce outside of the US including Mexico.
Ping certainly does more club head manufacturing in the US than others. But plenty of their clubs (and the component parts they buy in) are not produced in the US. As far as iron club heads because they don't do much in the way of forging they can do production in house and in the US. The overhead for producing forgings is too much to do in house and the US foundries where companies got their heads from aren't doing much in golf, with scale being a contributing factor. I don't think they do much wood manufacturing (particularly titanium) in house or in the US, but I'm not sure about that.
If Hogan are doing finally assembly etc in Ft Worth, they're doing pretty well. And what they're doing is very similar to what all American club manufacturers are doing.
At the end of the day there's a lot less handwork being done to clubs. Manufacturers all buy components from various sources and in a globalized world a lot of that is abroad. Some is high wage Japan, some low wage China. Some production is in the US. To think otherwise is a bit naive. At the end of the day the clubs in any modern golf bag there's almost no chance of there being all US production and a very high chance of a big mixture.