The Great Depression profoundly affected John Steinbeck's writing, as it provided the backdrop for many of his most famous works. This economic crisis highlighted the struggles of working-class Americans, prompting Steinbeck to focus on themes of social injustice, poverty, and the resilience of the human spirit. Books like "The Grapes of Wrath" specifically illustrate the plight of migrant workers during this time. The hardships faced by individuals added depth to his characters and narratives, making his work resonate with readers who identified with their struggles. Steinbeck's empathy and commitment to social issues were deeply shaped by these experiences.