사회민주주의
Social democracy, an ideology advocating progressive modification of capitalism, emerged in the 20th century and was influenced by socialism. Broadly defined as a project that aims to correct through government reformism what it regards as the intrinsic defects of capitalism by reducing inequalities, social democracy was also not against the state. Several commentators have noted strong similarities between social liberalism and social democracy, with one political scientist even calling American liberalism "bootleg social democracy" due to the absence of a significant social democratic tradition in the United States that liberals have tried to rectify. Another movement associated with modern democracy, Christian democracy, hopes to spread Catholic social ideas and has gained a large following in some European nations. The early roots of Christian democracy developed as a reaction against the industrialisation and urbanisation associated with "laissez-faire" liberalism in the 19th century. Despite these complex relationships, some scholars have argued that liberalism actually "rejects ideological thinking" altogether, largely because such thinking could lead to unrealistic expectations for human society.