The development of American liberty and war songs from a few themes during the pre-Revolutionary period to a distinct form of American popular music in the Civil War period reflects the growth of many aspects of American culture and thought. This study therefore treats as historical documents the songs published in newspapers, broadsides, and songbooks during the period from 1765 to 1865. Chapter One briefly summarizes the development of American popular music before 1765 and provides other introductory material. Chapter Two examines the origin and development of the first liberty-song themes in the period from 1765 to 1775. Chapters Three and Four cover songs written during the American Revolution. Chapter Three describes battle songs, emphasizing the use of humor, and Chapter Four examines the figures treated in the war song. Chapter Five covers the War of 1812, concentrating on the naval song, and describes the first use of dialect in the American war song. Chapter Six covers the Mexican War (1846-1848) and includes discussion of the aggressive American attitude toward the war as evidenced in song. Chapter Six also examines the first antiwar songs. Chapters Seven and Eight deal with the Civil War. Chapter Seven treats derivative war songs, including "Dixie" and "The Battle Hymn of the Republic." Chapter Eight treats prominent composers of popular war songs during the Civil War: Stephen F. Foster, George F. Root, and Henry Clay Work. Chapter Nine concludes the study with observations on the development of war songs from 1765 to 1865.