A slave in Key’s context would have been anyone with a king over him. The real problem with slavery is that it makes one man more than a man and another man less than a man. It’s the same with aristocracy.
Now compare that with the lyrics to many of our state songs. Some state songs are fine, because they were written by professionals. “Oklahoma!”, for example, or “Take Me Home, Country Roads.” But then there are cases like Alabama. There is no question the state song of Alabama should be “Sweet Home Alabama.”
While I’m at it, the national anthem of Australia should be “Waltzing Matilda.”
Same