Territorialism in the U.S., 1789-Present (Maps) » 005–States and Territories of the United States of America (March 4, 1791 to September 9, 1791)

March 4, 1791: The Vermont Republic, which had portions claimed by New York and New Hampshire and, while unrecognized by the United States, was a de facto independent country, was admitted as the 14th state, Vermont.