The essays remain valuable because they explain how prominent supporters understood particular constitutional mechanisms. They discuss federalism, representation, separation of powers, the presidency, the Senate, and the judiciary in far more detail than the Constitution's brief clauses do. That explanation can help a reader see why a feature was defended. It cannot add a power that the Constitution does not grant or cancel a rule the text does contain. Courts and scholars may use an essay as historical evidence, but constitutional text, valid amendments, statutes, and controlling precedent have different legal authority.

Four essay numbers deserve separate places in your memory. Federalist No. 10 asks how a republic can control the harmful effects of faction, especially an unjust majority faction. No. 51 asks how the structure of government can keep each institution within constitutional limits. No. 70 defends unity and energy in the executive. No. 78 defends judicial independence and explains the judiciary's duty to follow the Constitution as higher law. These essays fit together, but they do not offer interchangeable answers. Each begins with a different institutional problem and proposes a different mechanism.

When a question names an essay, translate the number into its central problem before looking at the answer choices: 10 means faction and the extended republic; 51 means institutional checking; 70 means executive energy and identifiable responsibility; 78 means judicial independence and higher law. Then ask what the scenario actually describes. A large number of competing interests is not a veto. A single accountable executive is not life tenure for judges. This method prevents a familiar title from pulling you toward a choice that belongs to another essay.

Video lesson: The Constitution, the Articles, and Federalism: Crash Course US History #8