Describe the ratification debate between Federalists and Anti-Federalists, including the purpose of The Federalist Papers, and explain how the promise of a Bill of Rights secured ratification.
Once the Constitution was signed in September 1787, it still needed 9 of 13 states to ratify (approve) it, and a fierce public debate broke out. Federalists supported the new Constitution and a stronger national government; Anti-Federalists worried a strong central government would trample individual liberties and state power, just as Britain had. Prominent Anti-Federalists like George Mason and Patrick Henry pointed out that the Constitution, as written, had no Bill of Rights protecting things like freedom of speech or trial by jury.
To win over skeptical New Yorkers, Alexander Hamilton, James Madison, and John Jay wrote 85 essays under the shared pen name "Publius," published in New York newspapers in 1787-88 and later collected as The Federalist (or The Federalist Papers). In Federalist No. 10, Madison argued a large republic could actually control the dangers of factions better than a small one; in Federalist No. 51, he explained checks and balances with the famous line that "if men were angels, no government would be necessary." The arguments worked, but not alone -- several states, including Massachusetts and Virginia, agreed to ratify only after Federalists promised to add a Bill of Rights right away. New Hampshire became the deciding ninth state in June 1788, and the new government began operating in 1789.
Mastery looks like: They can explain the core disagreement between Federalists and Anti-Federalists and describe how the promise of a Bill of Rights resolved the ratification standoff.
Common stumbles: Confusing "Federalist" and "Anti-Federalist" positions, or assuming the Bill of Rights was part of the original 1787 Constitution rather than a later addition.