Athens, Sparta, or Macedonia was three of the larger city states that ruled almost anything it touched.<span />
The 13th Amendment was the amendment that abolished slavery in 1864. The problem with these Georgia's Black Codes is that they were just another way of keeping the blacks in a cycle of slavery. Slavery was prohibited in all instances except as a punishment for crime. Most of the African-Americans after the war have been jobless and this law basically made it possible for them to be arrested for being jobless and put to slavery once again.
I think the answer is City dwelers
The answer is the An Lushan Rebellion. The rebellion cost the lives of hundreds of thousands. Although the Tang won the rebellion cost them their central government and the military as well as the economy.