ideologies for a number of reasons. Ideological affiliations for political parties send signals about the types of policies they might pursue if they were in power. Ideologies also differentiate parties from one another, so that voters can select the party that advances the policies that they most prefer. A party may also seek to advance an ideology by convincing voters to adopt its belief system. Common ideologies that can form a central part of the identity of a political party include liberalism, conservatism, socialism, communism, anarchism, fascism, feminism, environmentalism, nationalism, fundamentalism, Islamism, and multiculturalism. Liberalism is the ideology that is most closely connected to the history of democracies and is often considered to be the dominant or default ideology of governing parties in much of the contemporary world. Many of the traditional competitors to liberal parties are conservative parties. Socialist, communist, anarchist, fascist, and nationalist parties are more recent developments, largely entering political competitions only in the 19th and 20th centuries. Feminism, environmentalism, multiculturalism, and certain types of fundamentalism became prominent towards the end of the 20th century. Parties can sometimes be organized according to their ideology using an economic left–right political spectrum. However, a simple left-right economic axis does not fully capture the variation in party ideologies. Other common axes that are used to compare the ideologies of political parties include ranges from liberal to authoritarian, from pro-establishment to anti-establishment, and from tolerant and pluralistic (in their behavior while participating in the political arena) to anti-system. Non-ideological parties Though ideologies are central to a large number of political parties around the world, not all political parties have an organizing ideology, or exist to promote ideological policies. For example, some political parties may be clientelistic or patronage-based organizations, which are largely concerned with distributing goods. Other political parties may be created as tools for the advancement of an individual politician. It is also common, in countries with important social cleavages along ethnic or racial lines, to represent the interests of one ethnic group or another. This may involve a non-ideological attachment to the interests of that group, or may be a commitment based on an ideology like identity politics. While any of these types of parties may be ideological, there are political parties that do not have any organizing ideology. Party systems Political parties are ubiquitous across both democratic and autocratic countries, and there is often very little change in