How and why did Arkansas farms change what they produced and how they produced it and what impact did that have upon the Delta?

The Arkansas River Valley bisects the Ozarks and the Ouachitas and offered the best farmland in the upland region. Beginning on the state’s western border, it ranges from twenty-five to thirty-five miles wide and extends almost 150 miles into the state. Originally valued for its cotton land, by the time of the Civil War, the region had the state’s most diverse agriculture.

Answer is mass marketing.