Which of the following factors had the greatest influence on agriculture in the south? water transportation for trade introduction of grain crops invention of the cotton gin

The invention of the cotton gin allowed for the production of cotton to skyrocket in the south, which is why it turned to more slave owning and  plantation society. The greatest influence on agriculture in the south was the invention of the cotton gin. 

Contributing factors  leading  to the harlem renaissance were the great migration of african americans to northern cities, which concentratedambitious  people in places where they could encourage each  other, and the first world war, which had created new industrial work opportunities for tens of thousands of people.