Yes Carolina was Justified in seceding
In the late 1800s, workers organized unions to solve their problems. Their problems were low wages and unsafe working conditions. First, workers formed local unions in single factories. These unions used strikes to try to force employers to increase wages or make working conditions safer.
"He built a second capital in the East, which led to the division of the Empire" would be the best way to describe how Diocletian affected the Roman Empire, since it had grown to a state where managing it under a single entity was too difficult.