In the 1930s, farmers from the Midwestern Dust Bowl states, especially Oklahoma and Arkansas, began to move to California. As well as 250,000 arrived by 1940, including a third which moved into the San Joaquin Valley. That at that time had a population of 540,000 in 1930. During the 1930s, some 2.5 million <span>people left the Plains states</span>
They got the jobs because their was a shortage to the amount of workers there were, and so the companies couldn't be discriminate, because they got merchandise to make. However, after the war, many of the Americans returned, and the businesses wanted to give the jobs back to the White Americans, so they fired many of the African Americans that were previously holding the jobs during the war
hope this helps
