Explain how amendments, Supreme Court decisions, legislation and informal practices have changed constitutional government, including amendments that altered the structure and functions of the federal government

Learning goal: Explain how constitutional government in the United States has changed over time as a result of amendments to the U.S. Constitution, Supreme Court decisions, legislation and informal practices, and analyze constitutional amendments that have altered provisions for the structure and functions of the federal government.

The original text of the Constitution, about 4,500 words long, has been amended only twenty-seven times, ten of them at once in 1791. Yet the government it describes in 2026 works very differently from the one George Washington led. The difference is explained by four channels of change, only one of which alters the words.

Channel 1: formal amendment. Article V sets two steps. Proposal: by two thirds of both houses of Congress, or by a convention called by Congress on the application of the legislatures of two thirds of the states. Ratification: by the legislatures of three fourths of the states, or by conventions in three fourths of the states, whichever method Congress chooses. Every one of the twenty-seven amendments was proposed by Congress; no Article V convention has ever been called. Only the Twenty-first Amendment (1933), which repealed Prohibition, was ratified by state conventions rather than legislatures. Article V also still protects one provision from ordinary amendment (a second protection, covering the slave-trade clause and the direct-tax clause of Article I, section 9, expired in 1808): no state may be deprived of its equal vote in the Senate without its consent. The high thresholds are deliberate. With fifty states, thirty-eight must ratify, so thirteen states can block any amendment.

Channel 2: Supreme Court decisions. When the Court interprets the Constitution, its reading governs until the Court changes it or an amendment overrides it. Marbury v. Madison (1803) established judicial review. Plessy v. Ferguson (1896) upheld state-mandated racial segregation under a "separate but equal" doctrine; Brown v. Board of Education (1954) held that segregated public schools violate the Equal Protection Clause of the Fourteenth Amendment, rejecting that doctrine in public education. The words of the Fourteenth Amendment did not change between 1896 and 1954; the Court's interpretation did. Similarly, Gideon v. Wainwright (1963) held that states must provide a lawyer to defendants in felony cases who cannot afford one, applying the Sixth Amendment to the states through the Fourteenth. Decisions can also provoke amendments, as the next section shows.

Channel 3: legislation. Congress fills in what the Constitution leaves open. Article III creates the Supreme Court but leaves the lower courts and the number of justices to Congress: the Judiciary Act of 1789 organized the federal courts, and the Court has had nine seats since 1869 because a statute says so. The Constitution names no executive departments; Congress created each by statute, from the Departments of State, War and the Treasury in 1789 to the Department of Homeland Security in 2002. The Administrative Procedure Act of 1946 defined how agencies make rules. Legislation such as the Civil Rights Act of 1964 has changed how constitutional rights are enforced in daily life.

Channel 4: informal practices. Some of the most important features of the government appear nowhere in the text. Political parties are not mentioned, yet they organize elections and Congress. The President's cabinet as a body is a custom; the text only lets the President require written opinions from department heads. Washington's choice not to seek a third term became a tradition that held until Franklin Roosevelt was elected in 1940 and 1944. Presidential electors are now pledged to candidates, although the framers expected them to use judgment. Executive agreements with other nations, made without Senate consent, are a practice that grew alongside treaties.

How the channels interact. The two-term tradition is the clearest case: an informal practice was broken, and the response was a formal amendment, the Twenty-second (1951), limiting a President to two elected terms. Court decisions have been overturned by amendment: Chisholm v. Georgia (1793) allowed a citizen of another state to sue Georgia in federal court, and the Eleventh Amendment (1795) removed that jurisdiction; Pollock v. Farmers' Loan and Trust Co. (1895) struck down a federal income tax, and the Sixteenth Amendment (1913) authorized taxes on incomes without apportionment among the states.

Amendments that altered structure and functions. The second standard asks about amendments that changed how the federal government is built or works, as distinct from amendments that protect individual rights.

- Eleventh (1795): limits federal courts' jurisdiction over suits against a state by citizens of another state or of a foreign country.
- Twelfth (1804): electors cast separate ballots for President and Vice President. In 1800 Thomas Jefferson and Aaron Burr each received 73 electoral votes, because electors then cast two undifferentiated votes, and the House had to break the tie.
- Sixteenth (1913): the income tax, which changed the federal government's fiscal capacity.
- Seventeenth (1913): direct popular election of senators, replacing selection by state legislatures.
- Twentieth (1933): moved the start of presidential terms to January 20 and of congressional terms to January 3, shortening the "lame duck" period.
- Twenty-second (1951): no person may be elected President more than twice, and a person who has served more than two years of another President's term may be elected only once.
- Twenty-third (1961): gives the District of Columbia presidential electors, no more than the least populous state.
- Twenty-fifth (1967): presidential succession and disability; its first section states that if the President is removed from office, dies or resigns, the Vice President becomes President; it allows a vice-presidential vacancy to be filled by presidential nomination confirmed by a majority of both houses, which happened for Gerald Ford in 1973 and Nelson Rockefeller in 1974. Its disability sections let the Vice President serve as Acting President without becoming President: a President may transfer power temporarily in writing (used, for example, in 2002 and 2007 while President George W. Bush was sedated for a medical procedure), and the Vice President and a majority of the Cabinet may declare the President unable to serve, with Congress deciding any dispute.
- Twenty-seventh (1992): a change in congressional pay cannot take effect until after the next House election.

A fully worked model. Question: how did the method of choosing the Vice President change, and through which channels? Original Article II: each elector cast two votes; the runner-up became Vice President. In 1796 this produced a President and Vice President from rival factions; in 1800 it produced a tie between running mates. Channel: formal amendment. The Twelfth Amendment (1804) required separate ballots. Channel: informal practice, as parties began nominating tickets, which the amendment accommodated. Later, the Twenty-fifth Amendment (1967) created a way to fill a vacancy in the office, which the original text lacked. So the office's structure changed by amendment twice, and its practical operation by party custom.

The misconception. Students often assume the Constitution changes only by amendment, or conversely that the Court "rewrites" it at will. Amendment changes the text; decisions change its authoritative interpretation and can be reversed by later decisions or by amendment; legislation and practice operate within the text's limits.

Worked example 1 — naming the channel: Classify four changes. (a) The Court has had nine justices since 1869: legislation, because Congress sets the number by statute. (b) Senators have been elected by the people since 1913: formal amendment (the Seventeenth). (c) Segregated public schools were held unconstitutional in 1954: Supreme Court decision (Brown), with no change in the text. (d) Presidents meet regularly with a cabinet: informal practice, since the text mentions only written opinions from department heads. The step students skip is asking whether the words of the Constitution changed; only in (b) did they.

Worked example 2 — counting the thresholds: With fifty states, how many must ratify an amendment and how many can block it? Three fourths of 50 is 37.5, and a fraction of a state cannot ratify, so 38 are needed. The number that can block is 50 minus 38 plus 1, which is 13: if 13 states refuse, only 37 remain, one short. In Congress, two thirds of those present and voting in each house must approve the proposal, assuming a quorum.

Worked example 3 — structure versus rights: Sort three amendments. The Twentieth changed when terms begin, a structural rule about the government's functioning. The Twenty-third gave the District of Columbia electors; it affects both structure (the electoral college) and participation, and a good answer says so rather than forcing one label. The Sixteenth expanded Congress's taxing power, a change in function. A rights amendment, by contrast, limits what government may do to persons, as the First does.

Channel timeline: On a timeline from 1789 to the present, place at least twelve changes, color-coded by channel (amendment, Court decision, legislation, informal practice). Draw an arrow wherever one channel responded to another (for example, Chisholm to the Eleventh Amendment; Pollock to the Sixteenth; the broken two-term tradition to the Twenty-second).

Independent performance: Write a 600-word answer to: Which channel has changed the federal government's structure and functions most since 1789? Success criteria: you describe all four channels with at least one correct, dated example each; you explain the Article V proposal and ratification methods; you analyze at least four amendments that altered structure or functions and say what each changed; you show one case where channels interacted; and you separate evidence from your judgment about which mattered most.