Specifically, not all manufacturing processes have moved to China as I understand it, just the ones that tend to be made more problemmatic due to labor cost/environmental controls as far as I'm aware. I'm a bit out of date on my scratching the surface of that industry, but my understanding was things like NAFTA and regulatory requirements tend to lead to an absolute minimum level of parts (I'm bundling in resource extraction and processing into fabrication, which technically, I shouldn't be, that's supply chain management from the manufacturer's perspective) fabrication being done in the U.S., with the main focus being final assembly (read: relatively unskilled or labor conducive to being automated). The rest below a particular fraction needed to claim "made in USA", and thus avoiding some sort of import duty liability or some such. Some places like Boeing make sweetheart deals with suppliers internationally to gain political capital and better treatment incentivewise; other places just run after the cheapest source they can get away with (without robust attention paid to QC from the horror stories I've heard).

There's a bit of an inflection point, because some fabrication/production has proved problemmatic beimg outsourced. For instance, turbine blades for jet engine manufacturing fabricated from certain lots of Chinese steel have had failure traced back to elevated sulfur levels in the atmosphere in China that weren't accomodated for in the original planning. That's just one example I know of.

Take this with a grain of salt. It's a hobby of mine, not my primary day-to-day, so if I'm talking out my rear, I'd love to be corrected by someone inside the industry. I'm a logistics nerd deep down, so I love drinking in these types of arcane quirks of reality vs. in theory.