This is not true. There is now a skill gap. There are countless examples that it isn't about being cheaper. The organisation and optimization of the workforce and infrastructure isn't something we can ignore. The choice of China isn't because it is cheaper, a lot of high-end and even luxury products are produced in China because they can ensure a high-quality manufacturing.
There are other places, as the comment above mentioned, that can produce for cheaper.
Of course it's true.
The US could do the exact same. Many high-quality, sophisticated goods are made in the US.
It's just cheaper to do in China because the salaries are lower and the costs of establishing more efficient business infrastructure are lower.
And since these companies care more about cost than anything, they choose China.
I think it was "Smarter Every Day," but there's a YouTube channel where the guy went all-out in trying to design, source, and manufacture a simple grill scrubber 100% in the US, and failed. He got the product finished and on the market, but it was literally impossible to do it with 100% American content. IIRC, part of the problem was suppliers that lied about their sourcing, but that still represents the complete lack of availability of US sources.
Yeah. Why wouldn't US sources be available?
People invest in things that maximize returns. 30 years ago they had a choice: invest in building out more manufacturing infrastructure in the US, or doing it in China. China was, and is, less expensive to run. So China got the investment dollars.
You could absolutely build any product in the US. You'd just also have to build the infrastructure to build the industrial base, and that means spending more money than you would in China.
It always comes down to cost. Always.