In 1823 in Boston; Daniel Webster, Edward Everett, and other prominent citizens formed the Bunker Hill Battle Monument Association to save part of the historic field and erect on it a great commemorative monument. The cornerstone was laid on June 17, 1825. During the Revolutionary Centennial years, 1876–83, Congress appropriated federal funds to match local funds for Revolutionary battle monuments, and through this means imposing monuments were erected at Bennington Battlefield, Vermont; Saratoga, Newburgh, and Oriskany, New York; Cowpens, South Carolina; Monmouth, New Jersey; and Groton, Connecticut. Of these, Cowpens is now a unit in the National Park System, and Bunker Hill, Bennington, Oriskany, and Monmouth are National Historic Landmarks.