There are and have been several movements regarding secession from the U.S. state of New York. Only one of them – the state of Vermont – succeeded. Among the unsuccessful ones, the most prominent included the proposed state of Long Island, usually proposed as consisting of Suffolk and Nassau counties; a state called Niagara, the western counties of New York state; the northern counties of New York state called Upstate New York; making the city of New York a state; a proposal for a new Peconic County on eastern Long Island; and for the borough of Staten Island to secede from New York City.
Article 4, Section 3 of the Constitution of the United States includes a provision that "no new State shall be formed or erected within the Jurisdiction of any other State; nor any State be formed by the...