Final answer:
In the Dred Scott case, slaves could not sue because they lacked standing or the right to sue as they were not considered citizens.
Step-by-step explanation:
The subject of the question is the Dred Scott case in US History. One key principle in the Dred Scott case was that slaves could not sue because they lacked standing or the right to sue since they were not considered citizens. This decision was based on the belief that slaves were property, not people with legal rights. Therefore, slaves were denied the ability to bring their cases to court.
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