Design and Development --4 -- America builds a navy -- Foreign trends -- Humphreys frigates -- War expansion -- "Gradual Increase" -- Final frigates -- Operational History -- 14 -- Early years--the Quasi-War and Barbary Wars -- War of 1812 -- Heavy frigate area -- Civil War and beyond -- Ships -- 23 -- Humphreys frigates -- War-built ships -- "Gradual Increase" frigates -- Other heavy frigates.