In what year did North Carolina ratify the U.S. Constitution?

What is the two-letter postal abbreviation for North Carolina? Which state uses the postal abbreviation "NC"? Raleigh is the capital of which state? What is the largest city in North Carolina by population? What is the official nickname of North Carolina? What is the state bird of North Carolina? What is the state flower of North Carolina? What is the two-letter postal abbreviation for North Dakota?