China has dominated this market because they are prepared to spend non profitable time processing soil for these minerals whereas Americans aren’t.
To be fair...
America outlawed the type of labor force that China uses to do that.
https://thehill.com/policy/international/5344318-china-rare-earth-minerals-uyghur/
You make it sound like communal work "for the greater good"...
It's literal slave labor in horrible conditions where the Chinese government doesn't care how fast it kills the slaves.