Internment camps for Japanese were in the West because the Japanese were in the West. The government owns lots more land in the West than in Georgia, and moving large numbers of ostensibly subversive people across the country would have been dumb and expensive.
Also, the Japanese could have been lynched in GA. That would not have been a good thing, either.
All of the camps were in the Mountain states or California. Only one was outside this area, in Arkansas.'
The evacuation order commenced the round-up of 120,000 Americans of Japanese heritage to one of 10 internment camps—officially called "relocation centers"—in California, Idaho, Utah, Arizona, Wyoming, Colorado, and Arkansas.