Vermont (VT) is a state located in the Northeastern region of the United States that shares borders with New York to the west, Massachusetts to the south, New Hampshire to the east, and the Canadian province of Quebec to the north. Admitted to the Union as the 15th state on March 4, 1791, Vermont was originally both an unrecognized sovereign republic (founded in 1777) and territory of the state of New York, that served as a supply base for the Continental Army during the Revolutionary War. It was also the first state to partially abolish slavery (while still a sovereign republic). The state capital of Montpelier is the second largest city, while the largest city of Burlington (pop. 47,000) is situated on the eastern shore of Lake Champlain and contains the state's largest concentration of universities. Vermont's population was 604,000 as of the 1997 preliminary census.