Liberalism is a political and moral philosophy based on the rights of the individual, liberty, consent of the governed, political equality, right to private property, and equality before the law. Different liberals espouse various and sometimes conflicting views depending on their understanding of these principles but generally support liberal democracy, private property, market economies, individual rights (including civil rights and human rights), secularism, rule of law, economic and political freedom, freedom of speech, freedom of the press, freedom of assembly, and freedom of religion.Generally support:

constitutional government and privacy rights Liberalism is frequently cited as a major ideology of modern history.Wolfe, p. 23.

Liberalism became a distinct movement in the Age of Enlightenment, gaining popularity among Western philosophers and economists. Liberalism sought to replace the norms of hereditary privilege, state religion, absolute monarchy, the divine right of kings, and traditional conservatism with representative democracy, rule of law, and equality under the law. Liberals also ended mercantilist policies, royal monopolies, and other trade barriers, instead promoting free trade and marketization. The philosopher John Locke is often credited with founding liberalism as a distinct tradition based on the social contract, arguing that each man has a natural right to life, liberty and property, and governments must not violate these rights. While the British liberal tradition emphasized expanding democracy, French liberalism emphasized rejecting authoritarianism.Kirchner, p. 3.

Leaders in the British Glorious Revolution of 1688, the American Revolution of 1776, and the French Revolution of 1789 used liberal philosophy to justify the armed overthrow of royal sovereignty. The 19th century saw liberal governments established in Europe and South America, and it was well-established alongside republicanism in the United States. In Victorian Britain, it was used to critique the political establishment, appealing to science and reason on behalf of the people.

During the 19th and early 20th centuries, liberalism in the Ottoman Empire and the Middle East influenced periods of reform, such as the Tanzimat and Al-Nahda, and the rise of constitutionalism, nationalism, and secularism. These changes, along with other factors, helped to create a sense of crisis within Islam, which continues to this day, leading to Islamic revivalism.

Before 1920, the main ideological opponents of liberalism were communism, conservatism, and socialism; liberalism then faced major ideological challenges from fascism and Marxism–Leninism. During the 20th century, liberal ideas spread further, especially in Western Europe, as liberal democracies were among the victors in both world wars and the Cold War.

Liberals sought and established a constitutional order that prized important individual freedoms, such as freedom of speech and freedom of association; an independent judiciary and public trial by jury; and the abolition of aristocratic privileges. Later waves of modern liberal thought and struggle were strongly influenced by the need to expand civil rights.Worell, Judith. Encyclopedia of women and gender, Volume I. Amsterdam: Elsevier, 2001. Liberals have advocated gender and racial equality in their drive to promote civil rights, and global civil rights movements in the 20th century achieved several objectives towards both goals. Other goals often accepted by liberals include universal suffrage and universal access to education. In Europe and North America, the establishment of social liberalism (often called simply liberalism in the United States) became a key component in expanding the welfare state."Liberalism in America: A Note for Europeans" by Arthur M. Schlesinger Jr. (1956) from: The Politics of Hope (Boston: Riverside Press, 1962). "Liberalism in the U.S. usage has little in common with the word as used in the politics of any other country, save possibly Britain."

21st-century liberal parties continue to wield power and influence throughout the world. The fundamental elements of contemporary society have liberal roots. The early waves of liberalism popularised economic individualism while expanding constitutional government and parliamentary authority.Gould, p. 3.

Definitions Origins

Liberal, liberty, libertarian, and libertine all trace their etymology to liber, a root from Latin that means "free".Gross, p. 5. One of the first recorded instances of liberal occurred in 1375 when it was used to describe the liberal arts in the context of an education desirable for a free-born man. The word's early connection with the classical education of a medieval university soon gave way to a proliferation of different denotations and connotations. Liberal could refer to "free in bestowing" as early as 1387, "made without stint" in 1433, "freely permitted" in 1530, and "free from restraint"—often as a pejorative remark—in the 16th and the 17th centuries.

In the 16th-century Kingdom of England, liberal could have positive or negative attributes in referring to someone's generosity or indiscretion. In Much Ado About Nothing, William Shakespeare wrote of "a liberal villaine" who "hath ... confest his vile encounters". With the rise of the Enlightenment, the word acquired decisively more positive undertones, defined as "free from narrow prejudice" in 1781 and "free from bigotry" in 1823. In 1815, the first use of liberalism appeared in English.Kirchner, pp. 2–3. In Spain, the liberales, the first group to use the liberal label in a political context,Palmer and Colton, p. 479. fought for decades to implement the Spanish Constitution of 1812. From 1820 to 1823, during the Trienio Liberal, King Ferdinand VII was compelled by the liberales to swear to uphold the 1812 Constitution. By the middle of the 19th century, liberal was used as a politicised term for parties and movements worldwide.Kirchner, Emil J. (1988). Liberal Parties in Western Europe. Cambridge University Press. . "Liberal parties were among the first political parties to form, and their long-serving and influential records, as participants in parliaments and governments, raise important questions ... ."

Yellow is the political colour most commonly associated with liberalism.Cassel-Picot, Muriel "The Liberal Democrats and the Green Cause: From Yellow to Green" in Leydier, Gilles and Martin, Alexia (2013) Environmental Issues in Political Discourse in Britain and Ireland. Cambridge Scholars Publishing. p. 105 . The United States differs from other countries in that conservatism is associated with red and liberalism with blue.

Modern usage and definitions In Europe and Latin America, liberalism means a moderate form of classical liberalism and includes both conservative liberalism (centre-right liberalism) and social liberalism (centre-left liberalism). In North America, liberalism almost exclusively refers to social liberalism. The dominant Canadian party is the Liberal Party, and the Democratic Party is usually considered liberal in the United States.Puddington, p. 142. "After a dozen years of centre-left Liberal Party rule, the Conservative Party emerged from the 2006 parliamentary elections with a plurality and established a fragile minority government."Grigsby, pp. 106–07. [Talking about the Democratic Party] "Its liberalism is, for the most part, the later version of liberalism – modern liberalism."Arnold, p. 3. "Modern liberalism occupies the left-of-center in the traditional political spectrum and is represented by the Democratic Party in the United States." In the United States, conservative liberals are usually called conservatives in a broad sense.

Social liberalism

Over time, the meaning of liberalism began to diverge in different parts of the world. Since the 1930s, liberalism is usually used without a qualifier in the United States, to refer to social liberalism, a variety of liberalism that endorses a regulated market economy and the expansion of civil and political rights, with the common good considered as compatible with or superior to the freedom of the individual.De Ruggiero, Guido (1959). The History of European Liberalism. pp. 155–157.

According to the Encyclopædia Britannica, "In the United States, liberalism is associated with the welfare-state policies of the New Deal programme of the Democratic administration of Pres. Franklin D. Roosevelt, whereas in Europe it is more commonly associated with a commitment to limited government and laissez-faire economic policies.""Liberalism". Encyclopædia Britannica. This variety of liberalism is also known as modern liberalism to distinguish it from classical liberalism, which in the United States evolved into modern conservatism. These two forms of liberalism comprise the two main poles of American politics, in the forms of modern American liberalism and modern American conservatism.Pease, Donald E.; Wiegman, Robyn (eds.) (2002). The Futures of American Studies. Duke University Press. p. 518.

Some liberals, who call themselves classical liberals, fiscal conservatives, or libertarians, endorse fundamental liberal ideals but diverge from modern liberal thought on the grounds that economic freedom is more important than social equality.Pena, David S. (2001). Economic Barbarism and Managerialism. p. 35. Consequently, the ideas of individualism and laissez-faire economics previously associated with classical liberalism are key components of modern American conservatism and movement conservatism, and became the basis for the emerging school of modern American libertarian thought.Rothbard, Murray (2006) . "The Libertarian Heritage: The American Revolution and Classical Liberalism". For a New Liberty: The Libertarian Manifesto. Mises Institute. . Retrieved 18 June 2015 – via LewRockewell.com In this American context, liberal is often used as a pejorative.

This political philosophy is exemplified by enactment of major social legislation and welfare programs. Two major examples in the United States are Franklin D. Roosevelt's New Deal policies and later Lyndon B. Johnson's Great Society, as well as other accomplishments such as the Works Progress Administration and the Social Security Act in 1935, as well as the Civil Rights Act of 1964 and the Voting Rights Act of 1965. Modern liberalism, in the United States and other major Western countries, now includes issues such as same-sex marriage, transgender rights, the abolition of capital punishment, reproductive rights and other women's rights, voting rights for all adult citizens, civil rights, environmental justice, and government protection of the right to an adequate standard of living. National social services, such as equal educational opportunities, access to health care, and transportation infrastructure are intended to meet the responsibility to promote the general welfare of all citizens as established by the United States Constitution.

Classical liberalism

Classical liberalism is a political tradition and a branch of liberalism that advocates free market and laissez-faire economics and civil liberties under the rule of law, with special emphasis on individual autonomy, limited government, economic freedom, political freedom and freedom of speech. Classical liberalism, contrary to liberal branches like social liberalism, looks more negatively on social policies, taxation and the state involvement in the lives of individuals, and it advocates deregulation.