John Marshall
Overview
 
John Marshall was the Chief Justice of the United States
Chief Justice of the United States
The Chief Justice of the United States is the head of the United States federal court system and the chief judge of the Supreme Court of the United States. The Chief Justice is one of nine Supreme Court justices; the other eight are the Associate Justices of the Supreme Court of the United States...

 (1801–1835) whose court opinions helped lay the basis for American constitutional law
United States constitutional law
United States constitutional law is the body of law governing the interpretation and implementation of the United States Constitution.- Introduction :United States constitutional law defines the scope and application of the terms of the Constitution...

 and made the Supreme Court of the United States
Supreme Court of the United States
The Supreme Court of the United States is the highest court in the United States. It has ultimate appellate jurisdiction over all state and federal courts, and original jurisdiction over a small range of cases...

 a coequal branch of government
Separation of powers under the United States Constitution
Separation of powers is a political doctrine originating from the United States Constitution, according to which the legislative, executive, and judicial branches of the United States government are kept distinct in order to prevent abuse of power. This U.S...

 along with the legislative and executive branches. Previously, Marshall had been a leader of the Federalist Party in Virginia and served in the United States House of Representatives
United States House of Representatives
The United States House of Representatives is one of the two Houses of the United States Congress, the bicameral legislature which also includes the Senate.The composition and powers of the House are established in Article One of the Constitution...

 from 1799 to 1800. He was Secretary of State
United States Secretary of State
The United States Secretary of State is the head of the United States Department of State, concerned with foreign affairs. The Secretary is a member of the Cabinet and the highest-ranking cabinet secretary both in line of succession and order of precedence...

 under President John Adams
John Adams
John Adams was an American lawyer, statesman, diplomat and political theorist. A leading champion of independence in 1776, he was the second President of the United States...

 from 1800 to 1801.

The longest-serving Chief Justice of the United States, Marshall dominated the Court for over three decades and played a significant role in the development of the American legal system.
Quotations

It is emphatically the province and duty of the judicial department to say what the law is...If two laws conflict with each other, the courts must decide on the operation of each...This is of the very essence of judicial duty.

Marbury v. Madison, 1 Cranch, 1317 (1803).

The people made the Constitution, and the people can unmake it. It is the creature of their own will, and lives only by their will.

Cohens v. Virginia, 6 Wheaton (19 U.S.) 264, 389 (1821).

The law does not expect a man to be prepared to defend every act of his life which may be suddenly and without notice alleged against him.

In the Trial of Aaron Burr, August 1807.

We must never forget that it is a constitution we are expounding.

4 Wheaton 316, 407.

This provision is made in a constitution, intended to endure for ages to come, and consequently, to be adapted to the various crises of human affairs.

4 Wheaton 316, 415.

Let the end be legitimate, let it be within the scope of the constitution, and all means which are appropriate, which are plainly adapted to that end, which are not prohibited, but consist with the letter and spirit of the constitution, are constitutional.

4 Wheaton 316, 421.

The power to tax involves the power to destroy.

4 Wheaton 316, 431.

 
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