Georgia was readmitted to the Union July 15th 1870.
Georgia was placed under military rule during the era of Reconstruction. It was first allowed back into the Union in 1868, but was expelled in 1868 because it wouldn’t ratify the 15th Amendment. On July 15th 1870 Georgia became the last of the Confederate states to be permanently readmitted to Union.
This is a good web site for more information about this topic GEORGIA RE-ADMITTED TO THE UNION