One of Steinbeck's primary purposes for writing, The Grapes of Wrath was to show how one family's struggle was representative of many others.
This is because, based on the complete text, the author wanted to show the commonalities in struggles and how the struggles of one family can very easily translate to that of others.
What is an Author's Purpose?
This refers to the motivation that an author has to write a literary piece and thus, impact his readers in a certain way.
Hence, we can see that one of Steinbeck's primary purposes for writing, The Grapes of Wrath was to show how one family's struggle was representative of many others.
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