Many speculations exist, however the one we stick to is simply, because of the, politics.
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it is apparent that the congressmen of Georgia could not decide what capital they wanted in the early 1700s until the early 1800s. Savannah was the 1st capital of Georgia. The congressmen of Georgia felt like the city wasn's improving , so they decide to move the city in 1785 to Augusta. Not long after that, Atlanta became our capital for good!:)
Cherokee's are the large Indian group that resisted the efforts of the government to move them.
Good geographical position
The US government wanted to move the Indian tribes away from the east because it wanted to displace them.
ability to move