American Operas, a List

1897 The Scarlet Letter Walter Damrosch 1910 The Pipe of Desire Frederick S. Converse 1910 Treemonisha Scott Joplin 1911 Natoma Victor Herbert 1911 Mona Horatio Parker 1913 Cyrano de Bergerac Walter Damrosch 1914 Madeleine Victor Herbert 1917 The Canterbury Pilgrims Reginald de Koven 1917 Azora Henry Hadley 1918 Shanewis Charles Wakefield Cadman 1919 The Legend Joseph Breil 1920 Rip Van Winkle Reginald de Koven 1920 Cleopatra's Night Henry Hadley 1926 The Witch of Salem Charles Wakefield Cadman 1927 The King's Henchman Deems Taylor 1931 Peter Ibbetson Deems Taylor 1933 The Emperor Jones Louis Gruenberg 1934 Merry Mount Howard Hanson 1934 Four Saints in Three Acts Virgil Thomson 1935 Porgy and Bess George Gershwin 1935 In the Pasha's Garden John Laurence Seymour 1937 The Man without a Country Walter Damrosch 1938 Amelia Goes to the Ball Gian Carlo Menotti 1939 The Old Maid and the Thief Gian Carlo Menotti 1939 The Devil and Daniel Webster Douglas Moore 1942 The Island God Gian Carlo Menotti 1942 Ramuntcho Deems Taylor 1946 The Medium Gian Carlo Menotti 1947 The Telephone, or L'Amour à trois Gian Carlo Menotti 1947 The Warrior Bernard Rogers 1947 The Mother of us All Virgil Thomson 1950 The Consul Gian Carlo Menotti 1951 Amahl and the Night Visitors Gian Carlo Menotti 1952 Trouble in Tahiti Leonard Bernstein 1953 The Taming of the Shrew Vittorio Giannini 1953 The Mighty Casey William Schuman 1954 The Tender Land Aaron Copland 1954 The Saint of Bleeker Street Gian Carlo Menotti 1955 The Ruby Norman Dello Joio 1956 Candide Leonard Bernstein 1956 Susannah Carlisle Floyd 1956 The Unicorn, the Gorgon and the Manticore Gian Carlo Menotti 1956 The Ballad of Baby Doe Douglas Moore 1958 Vanessa Samuel Barber 1963 The Last Savage Gian Carlo Menotti 1966 Antony and Cleopatra Samuel Barber 1976 Einstein on the Beach Philip Glass 1977 The Women in the Garden Vivian Fine 1979 The Village Singer Stephen Paulus 1979 Sweeney Todd Stephen Sondheim 1981 Satyagraha Philip Glass 1982 The Postman Always Rings Twice Stephen Paulus 1984 Akhnaten Philip Glass 1987 Nixon in China John Adams 1991 The Death of Klinghoffer John Adams 1991 The ghosts of Versailles John Corigliano 1991 Orphée Philip Glass 1992 McTeague  William Elden Bolcom 1994 The Dangerous Liaisons Conrad Susa 1995 Harvey Milk Stewart Wallace 1996 Rent Jonathan Larson 1998 Little Women  Mark Adamo 1998 A Streetcar Named Desire Andre Previn 1999 A View from the Bridge   William Elden Bolcom 1999 The Great Gatsby  John Harbison 2000 El Niño John Adams 2000 Dead Man Walking Jake Heggie 2005 Doctor Atomic John Adams 2005 Margaret Garner Richard Danielpour 2005 Grendel  Elliot Goldenthal 2005 An American Tragedy  Tobias Picker 2007 Appomattox Philip Glass 2008 The Bonesetter’s Daughter Stewart Wallace 2009 The Letter Paul Moravec 2011 Heart of a Soldier Christopher Theofanidis

I'm not sure Victor Herbert counts. He was born in Germany and brought the style of German operetta to American. He was very influential here.  Menotti is our only composer to emphasize opera.  Nothing before Porgy and Bess remains in the repertoire.

I have to say this is a truly pathetic list.