What was in acceptance speech for 1940 Pulitzer prize of John Steinbeck?

John Steinbeck won the American Booksellers' Award in 1939 after his novel, The Grapes of Wrath, was named bestseller of the year. He was also inducted into the National Institute of Arts and Letters.

In 1940, Steinbeck was awarded a Pulitzer Prizefor The Grapes of Wrath.