In what year did New Jersey ratify the U.S. Constitution?

What is the two-letter postal abbreviation for New Jersey? Which state uses the postal abbreviation "NJ"? Trenton is the capital of which state? What is the largest city in New Jersey by population? What is the official nickname of New Jersey? What is the state bird of New Jersey? What is the state flower of New Jersey? What is the two-letter postal abbreviation for New Mexico?