interestingly, the most intense clusters of robots are in Michigan, Delaware and Texas. by contrast, there's not so much robotic clustering in California. also, this optimistic note: Some of the sectors with the biggest job losses were ones that didn't automate intensively, like textiles and paper products. That goes to show that keeping out robots won't necessarily protect your job.
It makes sense to me. Historically, a lot of America's manufacturing has been either around the Great Lakes (i.e., the Rust Belt) or the mid-Atlantic / Georgia (i.e., where manufacturing went after those states were able to undercut the Northeast / midwest on labor costs). I've never really thought of California as a major manufacturing hub.