What does it mean when a supreme court case is called a landmark case?

A landmark case is a court case that is studied because it has historical and legal significance.

A case that could have affected the Supreme Court in a positive or in a negative way, and landmark cases are the most in important cases in the U.S Supreme court. For Example the first landmark case was Marbury v. Madison, It was the first time the Supreme court had ever used Judicial Review. Also in a most landmark cases it involves U.S citizens rights.

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i would say your answer would be the second option.

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they wanted the u.s. to fight on the side of the central powers.