Why did some oppose the Constitution?

Anti-Federalists opposed the Constitution because they feared the proposed federal government would become too strong, would absorb the powers of the states, and would lack adequate protection for individual liberties. Their concerns fell into five overlapping categories that shaped the ratification debate of 1787 to 1790 and produced the federal Bill of Rights.

The first concern was consolidation. Anti-Federalists believed the Constitution would create a national government that would gradually absorb the states. Patrick Henry asked at the Virginia ratifying convention on June 5, 1788 why the document began "We the People" rather than "We the States," interpreting the change as evidence of a unitary plan that would dissolve the states into a single national entity. Anti-Federalists pointed to the Necessary and Proper Clause in Article I, Section 8 and to the Supremacy Clause in Article VI as openings through which federal power could expand without limit.

The second concern was the absence of a Bill of Rights. The Constitution as drafted in Philadelphia included no general protection for freedom of speech, religion, press, assembly, or trial by jury, and it offered no general guarantee against unreasonable searches or cruel punishments. George Mason of Virginia listed the absence of a Bill of Rights as his first complaint in his October 1787 Objections to the Proposed Federal Constitution, and refused to sign the document for that reason. Federalists responded that the federal government had only enumerated powers and could not invade liberties not granted to it, but Anti-Federalists were unconvinced and demanded explicit guarantees.

The third concern was size. Following Montesquieu's argument in The Spirit of the Laws of 1748, many Anti-Federalists believed republics required small territories so that representatives could know their constituents, citizens could observe their leaders, and a shared culture could sustain civic virtue. They argued that a country as large and diverse as the United States could not function as a republic and would inevitably devolve into tyranny or aristocracy. James Madison answered this argument in Federalist No. 10.

The fourth concern was the federal taxing power, the federal judiciary's encroachment on state courts, and the standing army that the Constitution permitted. Anti-Federalists feared these would centralize wealth, weaken local justice, and threaten civilian liberty.

The fifth concern was specific provisions including six year Senate terms, the lack of presidential rotation, the elasticity of the Necessary and Proper Clause, and the Supremacy Clause. Anti-Federalist writers such as Brutus, Federal Farmer, Centinel, and Cato pressed these objections in newspapers from October 1787 through August 1788. Although Anti-Federalists lost the ratification fight, James Madison drafted what became the Bill of Rights in 1789 in response to their concerns, and the first ten amendments were ratified December 15, 1791.