How does the author develop the topic of the Dust Bowl?

In the 1910s and 1920s the southern Plains was "the last frontier of agriculture" according to the government, when rising wheat prices, a war in Europe, a series of unusually wet years, and generous federal farm policies created a land boom - the Great Plow-Up that turned 5.2 million acres of thick native grassland into wheat fields. Newcomers rushed in and towns sprang up overnight.