Hello eren
Welcome to Microsoft Q&A Platform, thanks for posting your query here.
I'm sorry to hear that you're having trouble creating a VM in the USA region. It's possible that the region you're trying to use is currently unavailable or that there are no available resources in that region for the VM size you're trying to use.
It's possible that the region you're trying to use is currently experiencing high demand, which could be causing the issue.
To resolve this issue, you can try selecting a different region or a different VM size. You can also try creating the VM at a later time when resources may become available.
Hope this helps.