Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Kemper County, Mississippi:

"

The peak of population in the rural county was in 1930. Mechanization of agriculture decreased the need for farm labor. From 1940 to 1970, the population declined markedly, as may be seen on the table below, as people moved to other areas for work. This was also the period of the second wave of the Great Migration, when 5 million African Americans moved out of the South to the North and especially to the West Coast, where the defense industry had many jobs, beginning during World War II.[6]