The US Navy actually divided things later in the sailing age by class and this by type of ship and not a unified rating system like the RN used. As an example, the Brandywine-class frigates were "1st Class Frigates" in the USN, while the rebuilt Macedonian was a "2nd Class Frigate" until she was razeed. With sloops, the Constellation, razees Macedonian and Cumberland, and the large sloops of the 1840s (Saratoga, Portsmouth, Plymouth, Albany, Germantown, Jamestown, and St Marys) were 1st Class Sloops, the Cyane, rebuilt Peacock, and the three designs of the Boston-class were 2nd Class Sloops, and the little Dale-class were rated 3rd Class Sloops.