What has a copyright dated August 19, 1919?

The Marine Corps Hymn holds a copyright dated August 19, 1919, which is significant as it marks the formal recognition of this particular piece of music associated with the United States Marine Corps. The hymn encapsulates the proud history, traditions, and ethos of the Marines, serving as a rallying cry that is well-known among military personnel and commemorates their service and sacrifices.

In contrast, the other options listed have different historical backgrounds and copyright statuses. The Star-Spangled Banner was composed in the early 19th century and became the national anthem much later, while the Pledge of Allegiance has a separate origin and is not copyrighted in the same way. The US Constitution, being a foundational document of the United States, is in the public domain and not subject to copyright protections. Each of these elements reflects different aspects of American history and culture, but the Marine Corps Hymn's copyright date of 1919 specifically marks it as a distinct musical work within military tradition.