Did Scott have a good reason to believe that he would win his case? What political events changed this?

The argument Scott used was that because he had lived in a territory where slavery was illegal, he could never again be an enslaved person. He did have reason to believe he would win because this was a doctrine that was recognized in common law for centuries in Europe.

the graphs indicate that few people in bolivia work in industry, as that is the least expressive sector shown in the respective graphic.