Aperson skilled in a certain craft is called

A craftsman or artisan. The terminology used may also depend on whether the craft is something active or some kind of art form. Though these are generic terms, there will be specific terms for the specific craft. For example, someone skilled in pottery will be referred to as an craftsman or artisan in general terms but would be called a potter or ceramist in specific terms.

The case was a u.s. supreme court decision that defined the scope of the u.s. congress's legislative power and how it relates to the powers of american state legislatures. the dispute in mcculloch involved the legality of the national bank and a tax that the state of maryland imposed on it.