How did the development of new technology after world war i affect farmers

It helped them produce more crops, more efficiently - primarily through wider access to cheaper mechanized farm technology. The losses in both human life and land management required technological optimisation to return food growth to pre war levels

The Civil War was essentially inevitable. Ever since Eli Whitney's invention of the cotton gin in the 1790s, the South had been on a completely different economic and social path from the North. ... Because the entire Southern economy became dependent on cotton, it also became dependent on slavery.