Answer:
The first penitentiary in the United States was opened in Pennsylvania.
Step-by-step explanation:
The Pennsylvania Penitentiary, also known as Eastern State Penitentiary, was opened in 1829 in Philadelphia. This penitentiary was designed to implement the "separate system," in which inmates were kept isolated from one another in individual cells in order to encourage reflection and repentance. This approach was seen as more humane and rehabilitative than the harsh punishment and public shaming that were commonly used at the time. The Pennsylvania Penitentiary was an influential model that was copied by other states, and it played a significant role in the development of the modern prison system.