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.