Liberalism, political doctrine that takes protecting and enhancing the freedom of the individual to be the central problem of politics. Liberals typically believe that government is necessary to protect individuals from being harmed by others, but they also recognize that government itself can pose a threat to liberty. As the revolutionary American pamphleteer Thomas Paine expressed it in Common Sense (1776), government is at best “a necessary evil.” Laws, judges, and police are needed to secure the individual’s life and liberty, but their coercive power may also be turned against him. The problem, then, is to devise a system that gives government the power necessary to protect individual liberty but also prevents those who govern from abusing that power.
The problem is compounded when one asks whether this is all that government can or should do on behalf of individual freedom. Some liberals—the so-called neoclassical liberals, or libertarians—answer that it is. Since the late 19th century, however, most liberals have insisted that the powers of government can promote as well as protect the freedom of the individual. According to modern liberalism, the chief task of government is to remove obstacles that prevent individuals from living freely or from fully realizing their potential. Such obstacles include poverty, disease, discrimination, and ignorance. The disagreement among liberals over whether government should promote individual freedom rather than merely protect it is reflected to some extent in the different prevailing conceptions of liberalism in the United States and Europe since the late 20th century. In the United States liberalism is associated with the welfare-state policies of the New Deal program 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 (see below Contemporary liberalism).