Once a decision is made on a case, that case can be used in the future to help
decide a similar case.
Law
This is also known as a

What type of law is it

Precedent -

Stare decisis

Stare decisis is a legal doctrine that obligates courts to follow historical cases when making a ruling on a similar case. Stare decisis ensures that cases with similar scenarios and facts are approached in the same way.

Explanation:

indigenous people north and south were displaced, died of disease, and were killed by europeans through slavery, rxpe, and war. in 1491, about 145 million people lived in the western hemisphere. by 1691, the population of indigenous americans had declined by 90-95 percent, or by around 130 million people."