In my case it was the opposite. The code done by the devs in the US was awful, the code did not compile, they didn't use git, one guy had the "working" copy of the project in his laptop...

We as the offshore team started to improve things a bit, we started using git, using CI pipelines to at least have the code always compiling, etc

After some months the CTO fired all the US devs and everybody is now offshore. We haven't had many prod issues and we deliver things faster than the last team

I guess my point is that it doesn't matter where the devs come from there are good and bad devs everywhere, if you hire good offshore devs they can be great