The population of georgia doubled from roughly 4 million people in 1960 to more than 8 million in 2000. the rapid increase in georgia's population in urban areas was part of the shift to a mostly urban society. the shift to urban society is part of

The shift to urban society is part of Georgia’s transition from an agricultural to industrial-based economy. 

Increase of population of a city is mostly due to people transferring from provinces to the city in the hopes of being gainfully employed. They tend to look for work where they can earn more and sustain their family needs.