Final answer:
John Steinbeck won the Pulitzer Prize for Fiction in 1940 for his novel 'The Grapes of Wrath'.
Step-by-step explanation:
John Steinbeck won the Pulitzer Prize for Fiction in 1940. He won the award for his novel 'The Grapes of Wrath', which tells the story of the Joad family's journey from drought-ridden Oklahoma to the promise of a new life in California during the Great Depression.