Founding
The Declaration of Independence
Thirteen colonies declare that governments derive their just powers from the consent of the governed, the premise every later structure builds on.
Reference
How the government has changed
A timeline of the structural milestones, 1776–2024: the founding documents, all 27 amendments, the expansion of the vote, watershed elections, and the laws and court decisions that reshaped federal power. Curated and editor-written; every milestone links to an official record. It describes what changed: not whether it was good.
Showing all 59 milestones. Filters narrow by your choice: there is no engagement algorithm.
Founding
From declaring independence to a working constitutional government.
Founding
The Articles of Confederation take effect
America's first constitution: a loose league with no executive, no federal courts, and no power to tax. Its weaknesses are the argument for the Constitution that replaces it.
Founding
The Constitution is signed
After a summer of compromises in Philadelphia, 39 delegates sign a wholly new framework: separated powers, a real executive, federal courts, and a Congress that can tax.
Founding
The Constitution is ratified
New Hampshire becomes the ninth state to ratify, crossing the threshold Article VII set. The new government convenes the following March.
Elections
The first presidential election
The Electoral College meets for the first time and unanimously chooses George Washington. The machinery of Article II runs its first test without a hitch, it will not stay that smooth.
Founding
The first Congress convenes
The Constitution's government goes live in New York City. Within months this Congress creates the first executive departments, the federal courts, and the Bill of Rights.
Institutions
The Judiciary Act builds the federal courts
Article III required only a Supreme Court; this act creates the district courts, the circuit system, and the office of Attorney General, the skeleton of the judiciary you can explore on the Courts pages.
Amendments
The Bill of Rights is ratified
The first ten amendments: speech, religion, press, arms, juries, due process, and the reservation of unlisted rights and powers to the people and the states, are ratified together, fulfilling the promise that sealed the Constitution's ratification.
Amendments
Amendment XI: Suits Against States
The Eleventh Amendment limits federal courts from hearing certain lawsuits brought against a state by residents of another state or country, an early statement of state sovereign immunity..
The growing republic
The young system is stress-tested: judicial review, contested elections, expansion, and the failure to resolve slavery.
Elections
1800: power changes parties peacefully
Jefferson's party defeats Adams's, and an Electoral College tie between Jefferson and his own running mate throws the choice to the House for 36 ballots. The system survives its first transfer of power between rivals, then patches itself with the Twelfth Amendment.
The courts
Marbury v. Madison: judicial review
The Supreme Court claims the power Article III never states: to strike down laws that conflict with the Constitution. Every court ruling in this app's feed descends from this move.
Amendments
Amendment XII: Election of President and Vice President
The Twelfth Amendment sets out how electors cast separate votes for President and Vice President, and what happens if no candidate wins a majority.
The courts
McCulloch v. Maryland: implied powers
Congress may charter a national bank though the Constitution never mentions one, the Necessary and Proper Clause covers means to legitimate ends, and states cannot tax the federal government. The legal foundation of broad federal power.
Elections
1824: the House picks a President
Four candidates split the electoral vote; no one has a majority. Under the Twelfth Amendment the House elects John Quincy Adams over the popular-vote leader Andrew Jackson, the last time the contingent election has been used for President.
The courts
Dred Scott v. Sandford
The Court rules that Black Americans cannot be citizens and Congress cannot ban slavery in the territories. Widely counted the Court's worst self-inflicted wound, it accelerates the war, and is overturned by the Fourteenth Amendment.
Elections
1860: Lincoln's election and the breaking point
Abraham Lincoln wins without a single Southern electoral vote; seven states secede before he takes office. The election that the constitutional order could not absorb, the war that follows produces three amendments.
Civil War & Reconstruction
The Union survives; the Reconstruction amendments rewrite the Constitution's promises.
Amendments
Amendment XIII: Abolition of Slavery
The Thirteenth Amendment abolished slavery and involuntary servitude in the United States, except as punishment for a crime, and gave Congress the power to enforce it..
Amendments
Amendment XIV: Citizenship, Due Process, and Equal Protection
The Fourteenth Amendment is among the most consequential.
Amendments
Amendment XV: Right to Vote, Race
The Fifteenth Amendment bars denying the right to vote on account of race, color, or previous condition of servitude, and lets Congress enforce it..
Elections
1876: the disputed Hayes–Tilden election
Rival slates of electors from three states force Congress to improvise a 15-member Electoral Commission, which awards every disputed vote to Hayes. The crisis ends Reconstruction and eventually produces the Electoral Count Act.
Industrial & Progressive era
A modern state takes shape: civil service, direct election of senators, the income tax, women's suffrage.
Institutions
The Pendleton Act ends the spoils system
After a disappointed office-seeker assassinates President Garfield, federal jobs begin moving from political patronage to competitive merit, the birth of the professional civil service.
The courts
Plessy v. Ferguson: 'separate but equal'
The Court blesses state-mandated segregation, hollowing out the Fourteenth Amendment for six decades. Justice Harlan dissents alone: 'Our Constitution is color-blind.'
Amendments
Amendment XVI: Federal Income Tax
The Sixteenth Amendment allows Congress to levy a federal income tax without apportioning it among the states by population..
Amendments
Amendment XVII: Popular Election of Senators
The Seventeenth Amendment provides for U.S.
Institutions
The Federal Reserve is created
A century of banking panics ends in a compromise: a central bank with regional branches, setting monetary policy at arm's length from both Congress and the President.
Amendments
Amendment XVIII: Prohibition of Intoxicating Liquors
The Eighteenth Amendment established nationwide Prohibition, banning the manufacture, sale, and transport of intoxicating liquors.
Amendments
Amendment XIX: Right to Vote, Sex
The Nineteenth Amendment bars denying the right to vote on account of sex, securing women's suffrage nationwide..
Suffrage & civil rights
The Indian Citizenship Act
Native Americans born in the United States become citizens by statute, though many states continue to block their votes for decades afterward.
Elections
1932: the New Deal realignment
In the depths of the Depression, Franklin Roosevelt's landslide re-orders American politics for a generation and launches the expansion of the federal government the next era's entries chart.
New Deal to Cold War
The federal government's reach expands, and the civil-rights era forces the promises of Reconstruction to be kept.
Amendments
Amendment XX: Terms of Office and Succession (“Lame Duck”)
The Twentieth Amendment sets when presidential and congressional terms begin and end, and addresses what happens if a President-elect dies or fails to qualify.
Amendments
Amendment XXI: Repeal of Prohibition
The Twenty-first Amendment repealed Prohibition (the Eighteenth Amendment) while letting states regulate alcohol within their borders..
Institutions
The Social Security Act
The New Deal's centerpiece makes the federal government a direct, permanent presence in individual economic life, and survives the constitutional challenge that much other New Deal legislation did not.
Institutions
The Administrative Procedure Act
The rulebook for the modern administrative state: how agencies must propose rules, take public comment, and face court review. Every regulatory action in this app's feed follows the process this law created.
Institutions
The National Security Act
One law builds the postwar security state: the Department of Defense, the CIA, the National Security Council, and an independent Air Force.
Amendments
Amendment XXII: Presidential Term Limits
The Twenty-second Amendment limits a President to two elected terms (and addresses partial terms served), formalizing a tradition broken only once..
The courts
Youngstown: limits on presidential power
President Truman seizes the steel mills during the Korean War; the Court says no: the President cannot make law, even in an emergency. Justice Jackson's concurrence becomes the standard framework for measuring executive power.
The courts
Brown v. Board of Education
A unanimous Court overrules Plessy: separate is inherently unequal. The decision remakes constitutional law's relationship to equality and shows that precedent, however entrenched, can fall.
Amendments
Amendment XXIII: Presidential Electors for the District of Columbia
The Twenty-third Amendment grants the District of Columbia electors in the Electoral College, as if it were a state, capped at the count of the least populous state..
Amendments
Amendment XXIV: Abolition of Poll Taxes
The Twenty-fourth Amendment bars conditioning the right to vote in federal elections on payment of a poll tax or other tax..
The courts
Reynolds v. Sims: one person, one vote
State legislative districts must be roughly equal in population. Malapportioned legislatures that let rural minorities rule are redrawn across the country, the case behind the district lines on this app's maps.
Suffrage & civil rights
The Civil Rights Act of 1964
Ninety-six years after the Fourteenth Amendment promised equal protection, Congress builds enforcement machinery: bans on discrimination in public accommodations, employment, and federally funded programs.
Suffrage & civil rights
The Voting Rights Act
Federal law finally gives the Fifteenth Amendment teeth: literacy tests are banned and jurisdictions with histories of discrimination need federal approval to change voting rules. Black registration in the South transforms within years.
The courts
Miranda v. Arizona
The Fifth Amendment reaches the police station: suspects must be told their rights before interrogation. A ruling so woven into practice that its warnings are recited on television.
Amendments
Amendment XXV: Presidential Succession and Disability
The Twenty-fifth Amendment sets out presidential succession and how to handle a President's death, resignation, removal, or inability to serve, including how a vacancy in the vice presidency is filled..
The modern era
Presidential power, campaign money, agency authority, and precedent itself become the battlegrounds.
Amendments
Amendment XXVI: Right to Vote, Age 18
The Twenty-sixth Amendment guarantees that citizens eighteen or older may not be denied the vote on account of age, lowering the voting age nationwide to 18..
The courts
Roe v. Wade
The Court locates a right to abortion in the Fourteenth Amendment's protection of liberty, setting off a half-century constitutional argument that Dobbs (2022) ends by overruling it.
Institutions
The Congressional Budget Act
After President Nixon refuses to spend appropriated funds, Congress rebuilds its power of the purse: a formal budget process, the Congressional Budget Office, and strict limits on presidential 'impoundment' of funds.
The courts
United States v. Nixon
Executive privilege exists, and loses, to a criminal subpoena. A unanimous Court orders the President to surrender the Watergate tapes; he resigns sixteen days later. No one, the ruling stands for, is above legal process.
Institutions
The Federal Election Commission is created
Post-Watergate amendments to the Federal Election Campaign Act create an independent agency to enforce contribution limits and, crucially for transparency, publish who gives what to whom. The campaign-finance figures on this site come from its data.
The courts
Chevron: courts defer to agencies
When a statute is ambiguous, courts should accept an agency's reasonable reading. For forty years the most-cited case in administrative law, the quiet engine of regulatory power, until Loper Bright shuts it off.
Amendments
Amendment XXVII: Congressional Pay
The Twenty-seventh Amendment delays any change in congressional pay until after the next House election.
Elections
2000: Bush v. Gore
The presidency turns on a few hundred votes in Florida. The Supreme Court halts the recount, deciding a presidential election for the first time, 537 votes and one court order settle it.
Institutions
The Department of Homeland Security is created
The largest federal reorganization since 1947 merges 22 agencies after the September 11 attacks, a reminder that the executive branch's shape is set by ordinary legislation.
The courts
Citizens United v. FEC
Corporations and unions may spend unlimited sums on independent political speech; the modern super-PAC era begins. The campaign-finance totals in this app's Officials pages are read against the world this ruling made.
The courts
Obergefell v. Hodges
Same-sex couples have a constitutional right to marry. The Fourteenth Amendment's liberty and equality guarantees, the Court holds, extend to 'new insight' about who is owed them.
The courts
Dobbs overrules Roe
After 49 years, the Court overrules Roe v. Wade and returns abortion regulation to the states, the rare, seismic event of a major precedent expressly overturned, and a live demonstration that constitutional law can move in both directions.
Institutions
The Electoral Count Reform Act
After the January 6, 2021 attack on the certification of the presidential vote, Congress rewrites the 1887 rules: the Vice President's role is expressly ministerial and the threshold for objections is raised.
The courts
Loper Bright overrules Chevron
Courts, not agencies, decide what ambiguous statutes mean. Forty years of Chevron deference ends, shifting power from the executive branch's experts to the judiciary, the biggest change to the administrative state in a generation.
The courts
Trump v. United States: presidential immunity
Former Presidents have absolute immunity from prosecution for core constitutional acts and presumptive immunity for other official acts. The decision redraws the line United States v. Nixon sketched between the presidency and the criminal law.