and utilitarianism, and a belief in progress. Classical liberals established political parties that were called "liberal", although in the United States classical liberalism came to dominate both existing major political parties. There was a revival of interest in classical liberalism in the 20th century led by Friedrich Hayek and Milton Friedman.
In the late 19th century, classical liberalism developed into neo-classical liberalism, which argued for government to be as small as possible in order to allow the exercise of individual freedom. In its most extreme form, it advocated Social Darwinism. Libertarianism is a modern form of neo-classical liberalism.