What action resulted in Georgia being placed under military rule during Reconstruction?

Georgia's refusal to ratify the 13th Amendment

Explanation:

The 13th amendment was made to abolish slavery in united states.

At that time, Georgia's economy was heavily reliant on Slaves as their main labor force. So the Governor of Georgia At that time refused to ratify the 13th amendment.

To handle this, The central Government at that time put Georgia under military rule in order to 'Force' Georgia to abolish slavery and ratify the 13th amendment.