USA made $75 and under?
Okay that's pretty easy actually.
Get a Spyderco.
Or a Kershaw.
My suggestions of what I've owned and loved:
*Spyderco Manix 2 - Beautiful solid heavy duty knife, I've owned several, I miss mine.
*Spyderco Native - Best bang for your buck knife in my opinion - Made in USA, s30v, nice FRN, good clip, feels good in hand. Around $50 - $60.
*Spyderco UKPK - Doesn't lock but you can get it under $40, made in the USA, and just a good knife.
*Kershaw JYD II - This is a bigger heavy duty knife but you can get it under $60 and it's made in the USA, you can also get the composite blade version which has a nice D2 cutting edge.
*Kershaw Rake - You can find this right around your price, sometimes a little over, sometimes a little under. This was my EDC for a long time, and for good reason. Has a great composite blade, nice G-10 handles, nice solid lock, wonderful blade shape, and a good pocket clip.
Those would be my recommendations for made in the USA around $75. Only thing about the Rake is you can't get it with serrations. You also can't get the JYD II Composite with a Combo edge.
You could always look at the classic Kershaw Leek. You can sometimes find a ZT 0350 for around your price range, you just gotta shop around a bit.