Which reason best explains the movement of georgia capitals as shown on the map

As new territories opened up, the population of Georgia shifted west.

Explanation:

As new territories opened up, the population of Georgia shifted west. As large inland areas neighboring the coastal area of the state had been obtained from Native American groups to white settlers, the center of population began shifting from Savannah and the coast.

Reference: Jackson, E. (2017). Georgia's Historic Capitals. [online] New Georgia Encyclopedia.