Though a lot of that was a political choice to outsource to China and similar. We've had a lot of new tech since 1900 - cars, electric motors, internet, computers and the like and I'm not sure it's led to inevitable unemployment as opposed to people doing different jobs. The times there were mass unemployment like the great depression were more down to dumb economics and politics rather than tech.

Even with AGI robots smarter than us I think there's a good chance it would go like the Antebellum South with robots replacing the slaves and humans planning their debutantes balls.