Green County v. Conness was a United States Supreme Court case that dealt with the issue of whether a county could be held liable for damages caused by a county employee. The case arose when a county employee, Conness, was driving a wagon owned by the county and negligently caused an accident that resulted in damages to a third party. The third party sued the county for damages, and the county argued that it could not be held liable for the employee's negligence. The Supreme Court held that the county could be held liable for the employee's negligence. The Court reasoned that the county was responsible for the employee's actions because it had control over the employee and the wagon. The Court also noted that the county had a duty to exercise reasonable care in the selection and supervision of its employees. Therefore, the Court held that the county could be held liable for the employee's negligence. In conclusion, the Supreme Court held that the county could be held liable for the employee's negligence in Green County v. Conness. The Court reasoned that the county had a duty to exercise reasonable care in the selection and supervision of its employees, and that it was responsible for the employee's actions because it had control over the employee and the wagon.

In the case of Green County v. Conness, the Supreme Court was asked to decide whether a county in Wisconsin could be held liable for damages caused by an act of its board of supervisors. The majority opinion found that counties are not responsible for such acts and therefore cannot be held liable. However, Justice Field dissented from this decision and argued that counties should indeed be held accountable when their boards commit wrongful acts which result in damage or injury to another party. He reasoned that since counties have been given certain powers by state legislatures, they should also bear responsibility for any wrongs committed while exercising those powers. Furthermore, he noted that allowing local governments to escape liability would encourage them to take actions with impunity and without regard for potential consequences or harm done to others as a result of their decisions.