I dont know about the newer speeco/huskees, but the older ones (ours is about 8 years old now) uses a barns pump and a prince valve. Top quality stuff. And the briggs and stratton is a USA motor as well. (unlike hondas).
Dont know it their is any truth to it, but I have heard that they dont use the barnes/prince stuff anymore. But even so, you'd be hard pressed to find ANY splitter that is 100% made in USA with 100% made in USA parts. And even if you did find one that "claimed" that, it would be hard to prove. Things like hydraulic fittings, even from the likes of parker and gates et. al. are getting outsourced. Where was the i-beam made? Sheet metal to make the tank? Are the bearings in the wheels SKF or timken? or are they made in china??
IMO, huskee is as USA made as any of them. And they are a really good splitter for the money and get pretty good reviews too.