From the National Park Service:
The Robert Gould Shaw and Massachusetts 54th Regiment Memorial, installed in 1884, a haunting bronze bas relief on the Boston Common, and created by famed sculptor Augustus Saint-Gaudens, commemorates the first Black regiment from the North in the Civil War. Although African Americans served in both the Revolutionary War and the War of 1812, Northern racist sentiments kept African Americans from taking up arms for the United States in the early part of the Civil War. However, a clause in Abraham Lincoln's 1863 Emancipation Proclamation allowed for the raising of Black regiments. Gov. John Andrew soon created the Massachusetts 54th Volunteer Infantry. He chose Robert Gould Shaw, the son of wealthy abolitionists, to serve as its colonel. Notable abolitionists including Frederick Douglass and local leaders such as Lewis Hayden recruited men for the 54th Regiment. African Americans enlisted from every region of the north, and from as far away as Canada and the Caribbean.
Through their heroic, yet tragic, assault on Fort Wagner, S.C., on on July 18, 1863, in which Shaw and many of his men died, the 54th helped erode Northern public opposition to the use of Black soldiers and inspired the enlistment of more than 180,000 Black soldiers into the Union’s forces.