Liberalism
What states want is shaped by their societies, their trade and their laws, and cooperation can endure.
Liberalism denies that anarchy dictates a single logic. It looks inside the state and at the ties between societies, and finds that preferences are not fixed by the system: who holds power domestically, how a government is held to account, what its citizens trade and with whom, and which laws it has bound itself to all shape what it seeks abroad.
Immanuel Kant's Perpetual Peace set out the argument that republics, commerce and a federation of free states could make peace something more than a pause between wars. The modern democratic peace research programme, associated with Michael Doyle among others, takes up the empirical claim that liberal democracies have very rarely fought one another. Robert Keohane and Joseph Nye described complex interdependence, in which multiple channels connect societies, force is a costly and often unusable instrument, and there is no clear hierarchy of issues.
Liberalism therefore expects international law, trade and institutions to change behaviour rather than merely record it, and it takes the growth of that machinery seriously as a fact about world politics. Its critics reply that these arrangements track power more closely than liberals allow, and hold up while they suit the strong.
Key thinkers
Immanuel Kant, Woodrow Wilson, Michael Doyle, Robert Keohane, Joseph Nye, Andrew Moravcsik.
Core concepts
democratic peace, complex interdependence, collective security, international law, commercial peace, domestic preferences.
Liberalism applied to 45 historical events
Every event on Theoria is read through all six theories. These are the readings Liberalism gives, moment by moment. Open one to compare it against the other five, or explore them on the interactive map.
American Revolution
1763-1783Stamp Act Crisis: The objection was procedural and consistently so: taxation required consent, consent required representation, and the colonies had none at Westminster. Merchants boycotted, assemblies resolved, Parliament retreated. This was a constitutional argument conducted...
8 moments read through Liberalism
Arab Spring
2010-2012Bouazizi Self-Immolation: The grievances were unemployment among educated young people, arbitrary policing and visible corruption, in a country with a strong labour federation and a professionalised army. Domestic conditions, not regional ideology, explain both the rising and why Tunis...
8 moments read through Liberalism
Bandung Conference
1955Colombo Powers Meet: The five were parliamentary states with active publics and recent independence movements, and their populations were hostile to any arrangement resembling the imperial relationships just ended. Domestic opinion made alignment with either bloc politically costl...
8 moments read through Liberalism
Berlin Conference and Scramble for Africa
1884-1914Leopold Expands Congo Claims: Stanley's agents obtained hundreds of treaties from chiefs who could not read them, in a language they did not speak, transferring a concept of exclusive alienable sovereignty that did not exist locally. Consent was manufactured on paper and then presented in ...
8 moments read through Liberalism
Bretton Woods System
1941-1973Atlantic Charter Economic Aims: Points four and five committed the signatories to improved labour standards, economic advancement and social security, which was a remarkable thing to promise in 1941. War aims stated as social welfare reflected a judgment that the last peace had failed for ec...
8 moments read through Liberalism
Chinese Communist Revolution
1945-1949Japanese Surrender in China: Eight years of war had wrecked the Nationalist state's finances, administration and legitimacy, and hyperinflation was already under way. A government that cannot maintain a currency loses the urban middle class that sustains it, and the collapse of confidence...
8 moments read through Liberalism
Cold War
1947-1991Truman Doctrine: Liberalism reads containment as a clash of domestic orders projected outward: an open society organizing resistance to an autocracy whose foreign conduct grew from its internal character. Truman framed the choice as one between ways of life because for liberal...
12 moments read through Liberalism
Congress of Vienna and Concert of Europe
1814-1822First Treaty of Paris: The treaty was made with a restored Bourbon king who had granted a charter with a legislature and guarantees of the Civil Code. The powers were not merely restoring a dynasty but underwriting a domestic settlement they judged capable of holding France quiet, a...
8 moments read through Liberalism
COVID-19 Pandemic
2019-2023Wuhan Cluster Reported: Physicians in Wuhan who circulated warnings among colleagues were reprimanded by local authorities for spreading rumours, and one of them later died of the disease. Suppressing information that embarrasses a local administration is a predictable failure mode o...
8 moments read through Liberalism
Cuban Missile Crisis
1962Soviet Deployment Begins: The decision was taken by a handful of men with no legislature, press or public consulted, and Soviet diplomats were not told. Systems without domestic scrutiny can move faster and can also commit to a course nobody has stress-tested, which is what happened he...
8 moments read through Liberalism
Fall of the Assad Government in Syria
2024Opposition Offensive Begins: The government had won the war militarily and never rebuilt the state: no economy, no services, salaries worth nothing, and conscription that emptied the country of young men. Legitimacy had been hollowed out long before the front broke.
8 moments read through Liberalism
World War I
1914-1918Assassination of Archduke Franz Ferdinand: The classical liberal perspective is not very strong in directly explaining the "cause" of the assassination itself, because the theory is more concerned with domestic political conditions and societal tensions than with individual violence. Nevertheless, the ...
13 moments read through Liberalism
Founding of the United Nations
1941-1945Atlantic Charter: Self-government for peoples deprived of it, freedom from fear and want, improved labour standards: the Charter defined the war's purpose in terms of what people should be able to expect from their governments. Framing an interstate conflict as a defence of dom...
8 moments read through Liberalism
French Revolution
1789-1799Estates-General Convenes: Voting by order or by head decided everything, because it decided whether the Third Estate's numbers counted. The crown treated it as procedure and lost control of the agenda within six weeks. Questions of representation are never technical; they determine whi...
8 moments read through Liberalism
From GATT to the World Trade Organization
1947-1995GATT Signed: The agreement rested on the judgment that the trade wars of the 1930s had contributed to the political catastrophe that followed. Liberalising commerce was pursued as a security policy, and its architects said so explicitly and repeatedly.
8 moments read through Liberalism
German Unification
1848-1871Frankfurt Parliament: The Frankfurt constitution was a serious liberal document: a bill of rights, an elected chamber, ministerial responsibility, trial by jury. It failed and its text supplied the template for German constitutionalism afterwards. Defeated constitutions have a way ...
8 moments read through Liberalism
Global Financial Crisis
2007-2009Subprime Losses Surface: Mortgage lending had been extended to borrowers who could not repay, encouraged by policy, by fee structures and by the belief that house prices only rose. Domestic political preferences about home ownership had built the exposure over a decade.
8 moments read through Liberalism
Great Depression
1929-1939Wall Street Crash: The immediate policy responses were shaped by domestic electorates demanding protection for their own producers, jobs and savings. Every government acted rationally for its own constituency and the sum of those decisions made all of them poorer, which is the c...
8 moments read through Liberalism
Gulf War
1990-1991Iraq Invades Kuwait: Kuwait had a partly elected assembly, which Iraq's propaganda ignored in favour of describing it as an artificial creation of British mapmaking. The argument that a state is a colonial invention has been used against many borders, and it justifies nothing abou...
8 moments read through Liberalism
Hamas-led Attack and Gaza War
2023-2025October 7 Attack: Israel was in its most severe internal political crisis in decades over judicial reform, with reservists threatening not to serve. Adversaries read domestic division as vulnerability, correctly or not, and it forms part of any account of the timing.
8 moments read through Liberalism
Indian Independence and Partition
1946-1948Cabinet Mission Arrives: The mission's plan proposed a federation with a weak centre and grouped provinces, an attempt to reconcile majority rule with minority security. Every constitutional device for that problem was on the table. The failure was not for want of designs but for want...
8 moments read through Liberalism
Iranian Revolution
1978-1979Qom Protests: Political parties, unions and independent press had been suppressed for twenty-five years, so opposition had nowhere to organise except the mosques, which the regime could not close. Eliminating every secular channel determined who would lead the movement when...
8 moments read through Liberalism
United States-led Iraq War
2002-2011Security Council Resolution 1441: Blair needed a Council resolution for domestic reasons that Bush did not, which is why Britain pushed hardest for the diplomatic route. Domestic requirements of one ally shaped the coalition's whole approach to the United Nations.
8 moments read through Liberalism
Korean War
1950-1953North Korea Invades: Both Korean regimes were authoritarian, both claimed to represent the whole nation, and neither faced any domestic check on going to war. Where no institution can restrain a leader's judgment about national unification, the decision rests on one man's reading ...
8 moments read through Liberalism
Rise and Failure of the League of Nations
1920-1946League Enters into Force: The design assumed that publicity would restrain aggression: disputes aired in an assembly, treaties registered and published, a delay before any resort to war. It was a bet that opinion could substitute for force, made by men who had just watched opinion fail...
8 moments read through Liberalism
Napoleonic Wars
1803-1815War Resumes after Amiens: Britain fought on borrowed money, sustained by a parliament that voted taxes it could actually collect and a public that lent to its own government cheaply. That capacity was political rather than merely financial. A state whose creditors are its citizens can ...
8 moments read through Liberalism
Creation of the Nuclear Non-Proliferation Treaty Regime
1957-1970IAEA Statute Enters Force: The bargain offered civil nuclear technology in exchange for accepting inspection, which appealed to states wanting electricity and prestige. Trading a benefit for a constraint is the only reliable way to secure voluntary submission to intrusive monitoring.
8 moments read through Liberalism
Nuremberg and Tokyo Trials
1945-1948London Charter Signed: The Charter guaranteed the defendants counsel, disclosure of evidence, the right to cross-examine and to give evidence themselves. Extending procedural rights to men accused of the century's worst crimes was the point rather than an embarrassment: the trial's ...
8 moments read through Liberalism
From Rio to the Paris Climate Agreement
1992-2016UN Framework Convention Adopted: Common but differentiated responsibilities recognised that the states that had emitted historically were not those that would emit most in future. Building equity into the architecture made agreement possible and made every subsequent negotiation about where t...
8 moments read through Liberalism
Treaty of Versailles and Paris Peace Settlement
1919-1923Paris Peace Conference Opens: Wilson arrived with a programme of open covenants, self-determination and a league, and to European publics exhausted by war he was received as something close to a saviour. Expectations of that height are not survivable. The gap between the promise and the tr...
8 moments read through Liberalism
Genocide Convention and Universal Declaration of Human Rights
1945-1951UN Charter Human Rights Commitments: For the first time a general treaty of the states system made the treatment of people by their own government a matter of international concern. However weak the obligation, the subject had been admitted to the agenda, and everything in this field since has be...
8 moments read through Liberalism
Rome Statute and Creation of the International Criminal Court
1989-2002Trinidad and Tobago Revives Proposal: Framing the proposal around narcotics rather than atrocity was a tactical choice that gave states a practical reason to engage. Building support for an institution by attaching it to a problem governments already wanted solved is standard and it worked.
8 moments read through Liberalism
Russia Annexes Crimea
2014Yanukovych Leaves Kyiv: Parliament voted to remove the president after he left the capital, by a procedure whose constitutionality Russia disputed and Ukraine defended. The legality of the transition became the central point in every subsequent argument about what followed.
8 moments read through Liberalism
Russia's Full-Scale Invasion of Ukraine
2022-2023Russia Recognizes Separatist Entities: The decision was announced after a televised security council meeting in which officials endorsed it one by one, visibly under pressure. A system with no constraint on the executive produced a decision that a wider deliberation might have stopped.
8 moments read through Liberalism
Russian Revolution
1917-1922February Strikes in Petrograd: The Duma had been demanding a government responsible to it for a decade and was refused, so when the crisis came no legitimate institution existed to absorb it. Autocracies that decline every reform remove the mechanisms that could have saved them, and are the...
8 moments read through Liberalism
Rwandan Genocide
1990-1994RPF Invades Rwanda: Rwanda was a one-party state under external pressure to democratise, and the invasion allowed the regime to define its domestic opponents as accomplices of the enemy. Liberalisation under war conditions gave extremists a platform and a target simultaneously.
8 moments read through Liberalism
World War II
1939-1945German Invasion of Poland: The invasion followed the collapse of collective security : the League of Nations had failed to punish earlier aggression, and appeasement removed the last restraints. Liberalism stresses that an aggressive authoritarian regime, unchecked by institutions, chos...
12 moments read through Liberalism
September 11
2001-2021The September 11 Attacks: Liberals locate the attack's meaning inside societies, not between states: an assault on an open society by men who exploited its openness. The liberal question of the era followed immediately: can democracies fight such enemies without dismantling the rule of...
9 moments read through Liberalism
Six-Day War
1967Egypt Moves Forces into Sinai: Nasser's authority rested on his standing as the champion of Arab nationalism, and inaction was domestically and regionally intolerable. Leaders whose legitimacy derives from a role must keep performing it, and the performance can commit the state beyond the l...
8 moments read through Liberalism
Suez Crisis
1956-1957Aswan Finance Withdrawn: The decision was made in Washington, not at the dam site. A Congress irritated by Egyptian arms purchases from the Soviet bloc, southern cotton interests wary of subsidising a competitor, and an election season all pushed the same way. What looked like grand s...
8 moments read through Liberalism
Syrian Uprising and War
2011-2023Daraa Protests and Crackdown: Fifty years of emergency law, an omnipresent security apparatus and a hereditary presidency had eliminated every mechanism for expressing dissent. The absence of any institution capable of absorbing grievance is what converted a local incident into a national ...
8 moments read through Liberalism
Thirty Years' War and Peace of Westphalia
1618-1648Defenestration of Prague: The estates were not a mob but a chartered assembly defending the Letter of Majesty, which guaranteed Protestant worship and which Ferdinand's officers had begun to ignore. Stripped of its violence, this was a constitutional argument about whether a ruler may ...
8 moments read through Liberalism
Vietnam War
1954-1975Geneva Accords Divide Vietnam: Elections were promised for 1956 and were not held, because the government in the south and its American sponsor expected to lose them. Cancelling a vote you have agreed to because you would lose it destroys the legitimacy of the arrangement it was supposed to...
8 moments read through Liberalism
Yom Kippur War and Arab Oil Embargo
1973-1974Egypt and Syria Attack: Egypt had expelled Soviet advisers and signalled willingness to negotiate for two years, and Israel's government judged that a settled public preferred the territories to a deal. Domestic complacency in a democracy can be as dangerous as any miscalculation by ...
8 moments read through Liberalism
Yugoslav Wars and Dayton Peace Agreement
1991-1995Slovenia Declares Independence: Slovenia and Croatia held referendums with overwhelming majorities for independence, invoking the self-determination that the federal constitution itself acknowledged. Every party could cite a principle , and the question of which unit holds the right to self-...
8 moments read through Liberalism