Help please with history i been struggled

Was the first african american to be appointed to the u.s. supreme court.

During what century did muhammad recieve his first revelation from god

The establishment of columbia as the state capital was important because a) it was located in the heart of the upcountry. b) it was located in the heart of the low-country. c) it was already established as a vital industrial center. d) it represented a compromise location central to most citizens.