The Federalist Papers (1787-1788)
After the Constitution was completed during the summer of 1787, the work of ratifying it (or approving it) began. As the Constitution itself required, 3/4ths of the states would have to approve the new Constitution before it would go into effect for those ratifying states.
The Constitution granted the national government more power than under the Articles of Confederation. Many Americans were concerned that the national government with its new powers, as well as the new division of power between the central and state governments, would threaten liberty.
In order to help convince their fellow Americans of their view that the Constitution would not threaten freedom, James Madison, Alexander Hamilton, and John Jay teamed up in 1788 to write a series of essays in defense of the Constitution. The essays, which appeared in newspapers addressed to the people of the state of New York, are known as the Federalist Papers. They are regarded as one of the most authoritative sources on the meaning of the Constitution, including constitutional principles such as checks and balances, federalism, and separation of powers.