Final answer:
The Pennsylvania system called for solitary confinement as a form of punishment in prisons after a long day of hard labor.
Step-by-step explanation:
The Pennsylvania system, also known as the separate system, called for solitary confinement as a form of punishment in prisons. After a long day of hard labor, prisoners would be placed in solitary confinement as a means of isolation and reflection on their actions. This system was implemented in the early 19th century with the belief that solitary confinement would lead to the moral redemption and rehabilitation of prisoners.