The most common answer to this question is that John Marshall affirmed the right of judicial review over Congressional legislation; however, the Chief Justice contributed much more to the Judicial branch and the federal government, in general.
John Marshall, fourth Chief Justice of the United States (1801-1835), was arguably the most influential person in the history of the judiciary. A brilliant jurist with a genial personality, Marshall used both traits to position the Judiciary as a co-equal branch of the US government and to prevent states from eroding federal power after the Eleventh Amendment was ratified.
In doing so, John Marshall successfully established the Judicial branch's power as a co-equal branch of government, and the Supreme Court as final arbiter of the US Constitution.
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