As the longest-serving chief justice to date, which John Adams-appointee was influential in establishing the issuance of a single majority opinion with one clear ruling?

Serving 34 years, 152 days, John Marshall is considered one of the Supreme Court's most influential justices. The former secretary of state and leader of the Federalist Party instilled judicial review, in which federal and state laws could be struck down by the court if they ran contrary to the Constitution. This solidified the separation of powers amongst branches of government.

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