It was called the Great War because the world has never seen a conflict of that size. Over 59 million troops were mobilized. Many millions of people died or get injured. The conflict reshaped politically, economically, socially, and culturally Europe and the whole world.
It was named like that because the people of those days did not believe that almost 30 years after that the world would be at the most disastrous conflict of its history.
In a 1939 letter, John Steinbeck wrote that his goal for The Grapes of Wrath was “to rip a reader's nerves to rags.” Through the novel, Steinbeck wanted readers to experience the life of the Dust Bowl migrants with whom he had spent time.