How do court rulings set precedents?

Precedent is generally established by a series of decisions. Sometimes, a single decision can create precedent. For example, a single statutory interpretation by the highest court of a state is generally considered originally part of the statute.

Explanation:

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"germany's geographic location was an advantage when it was on the offensive in the war because it was situated next to an extremely wide river, the rhine, which was difficult for the allies to cross."