Have you got your dates right?
1919 -- end of World War I
1920s -- boom time -- stock market rose a lot -- many people got rich. Even the farmers had decent weather for growing crops
1930s -- Great Depression. Stock market dropped dramatically in 1929. Many people lost everything. Even the weather was uncooperative as drought hit the Great Plains. The Depression didn't really end until 1942 when we joined in World War II.