What does the Constitution protect?

The Constitution protects the fundamental rights and freedoms of Americans, including those listed in the Bill of Rights, in later amendments, and in the original 1787 text itself. Even before the Bill of Rights, Article I and Article III contained important protections. Article I, Section 9 forbids Congress to suspend the writ of habeas corpus except in cases of rebellion or invasion, prohibits bills of attainder and ex post facto laws, and bars federal taxation of state exports. Article I, Section 10 imposes parallel limits on state governments. Article III guarantees jury trials for federal crimes, and Article VI bars any religious test for federal office.

The Bill of Rights, ratified in 1791, added specific guarantees: free exercise of religion and bar on government establishment of religion, freedom of speech, press, assembly, and petition under the First Amendment; the right to keep and bear arms under the Second; freedom from peacetime quartering of soldiers under the Third; freedom from unreasonable searches and seizures under the Fourth; due process, protection against double jeopardy, self-incrimination, and uncompensated takings under the Fifth; speedy and public trial by impartial jury, confrontation, and counsel under the Sixth; civil jury trial under the Seventh; freedom from cruel and unusual punishment and excessive bail or fines under the Eighth. The Ninth Amendment recognized unenumerated rights retained by the people, and the Tenth reserved powers to states or people.

Later amendments extended protections further. The Thirteenth abolished slavery, the Fourteenth guaranteed equal protection and due process against state action, and the Fifteenth, Nineteenth, Twenty-Fourth, and Twenty-Sixth Amendments expanded voting rights.

The Constitution protects rights not just by listing them but by structuring power. Separation of powers, federalism, judicial review, fixed terms of office, and the difficulty of amendment all make it harder for any momentary majority or single official to override individual rights. Federal courts enforce these protections in cases brought by citizens against federal, state, or local governments. The protections apply to all persons within the United States, citizens and non-citizens alike, with limited exceptions like the right to vote in federal elections, which is reserved to citizens.