Final answer:
The composers who contributed to the golden era of American musical theater were George Gershwin, Cole Porter, Richard Rodgers, and Frank Loesser.
Step-by-step explanation:
The composers who contributed to the creation of the golden era of American musical theater were George Gershwin, Cole Porter, Richard Rodgers, and Frank Loesser. They were responsible for writing some of the most iconic and influential musicals in American theater history. For example, George and Ira Gershwin's musical 'Of Thee I Sing' was the first musical to win the Pulitzer Prize for drama. Richard Rodgers and Oscar Hammerstein II's musical 'Oklahoma!' changed the rules of musical theater forever.