Intel CPUs & Memory are made here in the US. Texas Instruments also makes parts here in the US. Barefoot networks used to make chips in the US, I don't know which products use those chips though.
I do pay extra for US made goods. But now I just try not to buy made in China.
Intel makes parts of the CPUs here, but I do not believe that they are actually assembled here. If they do, then US made chips aren't sold in the US but are sold abroad. All Intel CPUs are marked as being made in the Philippines, Costa Rica, or Malaysia. At least all the ones available here. I've never seen chips marked from anywhere else. Ever. I think Intel makes more NAND Flash memory here than anything else. However any electronic item you buy will have parts sourced from all over the planet.
You can talk a big game about buying US made stuff all you want but you can't avoid getting stuff made in China. Part of the problem is that you can't realistically know where every single part in every object you buy is made. The U.S. has intentionally priced itself out of being a country where manufacturing can take place. We have too many laws, regulations and overly powerful labor unions. All of that helps to force the price of manufacturing to reach a point where products can not be sold at competitive prices if they are made here.