If a court makes a ruling based on a principle established in a previous ruling from another court, it is an example of

stare decisis

Explanation:

In law, stare decisis can be described as a situation in which historical cases are used for forming a rule when a similar case is seen. In this type of system, rules are formed in consideration of the previous rules which were acknowledged for a similar case. Stare decisis simply means to stand by what is already decided. The principle of stare decisis is the core of U.S common law. All court relies on U.S supreme court precedents.

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