The differences between the Federalists and the Antifederalists are vast and at times complex. Federalists’ beliefs could be better described as nationalist. The Federalists were instrumental in 1787 in shaping the new US Constitution, which strengthened the national government at the expense, according to the Antifederalists, of the states and the people. The Antifederalists opposed the ratification of the US Constitution, but they never organized efficiently across all thirteen states, and so had to fight the ratification at every state convention. Their great success was in forcing the first Congress under the new Constitution to establish a bill of rights to ensure the liberties that the Antifederalists felt the Constitution violated.
The Bill of Rights is a list of 10 constitutional amendments that secure the basic rights and privileges of American citizens. They include the right to free speech, the right to a speedy trial, the right to due process under the law, and protections against cruel and unusual punishments. To accommodate Anti-Federalist concerns of excessive federal power, the Bill of Rights also reserves any power that is not given to the federal government to the states and to the people.
Since its adoption, the Bill of Rights has become the most important part of the Constitution for most Americans. In Supreme Court cases, the Amendments are debated more frequently than the Articles. They have been cited to protect the free speech of Civil Rights activists, protect Americans from unlawful government surveillance, and grant citizens Miranda rights during arrest. It is impossible to know what our republic would look like today without the persistence of the Anti-Federalists over two hundred years ago.