Which best describes county governments?
They are overseen by a mayor and department chairs
They are established as outlined by the US Constitution
They have executive, legislative, and judicial branches,
They are established as outlined by a state's constitution,

County governments are established as outlined by a state's constitution.

Option (D) is correct

Explanation:

The county government is the local government. The County government is governed by the board of county commissioners elected by the citizens of a country. These commissioners are elected for a term of four years. The county government performs various functions such as registering voters, looking after health and welfare and maintaining records, etc.

The authority of the county government is limited by state so these governments are established and controlled by the state's constitution.

(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity

the phenomenon that would be cited as evidence of increased economic interdependence between europe and the americas is  the development of mercantilism.

this theory suggests that the wealth of a country depends on its economic assets, or capital.

hope this : )