They don't "have them", they're building them.
https://www.micron.com/us-expansion/id
> Micron has already achieved key construction milestones on its first Idaho fab with DRAM output scheduled to begin in 2027.
https://investors.micron.com/news-releases/news-release-deta...
> Production is expected to start in 2030 with the fabs ramping throughout the decade.
Until they start outputting DRAM in any meaningful quantity, they're not relevant.
It looks like it's still a big difference between how the US and EU are responding to the chip supply wars. The US is actually building their own manufacturing capabilities domestically while the EU is apparently doing nothing, which is unfortunate.
> They don't "have them", they're building them.
According to wikipedia Micron Fab 6 in Virginia started production in 1997 and is still operating