Most ancient and historical cities also had administrative districts. These were used by the government for taxation and social control. Administrative districts are usually larger than neighbourhoods. They often cover areas that are larger than just one neighbourhood. Sometimes, administrative districts are just one neighbourhood. This leads to a lot of control of social life by officials. For example, in the T’ang period Chinese capital city Chang’an, neighbourhoods were districts. There were state officials who controlled life and activity at the neighbourhood level.