Agriculture went through a major transformation after WWII. New tractors, other motorized farming equipment, fertilizers, and establishing crop rotation farming made farming easier and more productive.
Since these new farming ideas and technologies improved farming and made it more efficient, a farmer could farm bigger tracts of land by himself.
This also had a cultural impact on Georgia. After WWII, more people moved to cities to look for jobs, since small farmers lost their jobs. They moved to urban areas to look for factory/business jobs.