What is the two-letter postal abbreviation for New York?

In what year was New Mexico admitted to the Union as a state? What is the official nickname of New Mexico? What is the state bird of New Mexico? What is the state flower of New Mexico? Which state uses the postal abbreviation "NY"? Albany is the capital of which state? What is the largest city in New York by population? In what year did New York ratify the U.S. Constitution?