When did the Marines come under the Department of the Navy?

The correct answer is significant because in 1834, the U.S. Navy took over the responsibilities and administration of the Marine Corps, placing it under the Department of the Navy. Prior to this change, the Marine Corps was part of the Army and was independent in its operations. This transition was essential in solidifying the Marines as a distinct military branch that operated alongside the Navy, allowing for coordinated operations at sea and during amphibious assaults.

This move ensured that the Marines would have access to resources and support from the Navy, which has been crucial for their missions, especially in amphibious warfare. It also established a clear chain of command and administrative structure that remains in place to this day. Understanding this historical context is important for grasping the evolution and role of the Marine Corps in the broader scope of U.S. military history.