What is Fascism and what is the historical context?

Historians, political scientists, and other scholars have long debated the exact nature of fascism. Historian Ian Kershaw once wrote that "trying to define 'fascism' is like trying to nail jelly to the wall. Each different group described as fascist has at least some unique elements, and many definitions of fascism have been criticized as either too broad or too narrow.

Fascism is a far-right, authoritarian, ultranationalist political ideology and movement characterized by a dictatorial leader, centralized autocracy, militarism, forcible suppression of opposition. Belief in a natural social hierarchy, subordination of individual interests for the perceived good of the nation and race, and strong regimentation of society and the economy. Since the end of World War II in 1945, few parties have openly described themselves as fascist; the term is more often used pejoratively by political opponents. The descriptions of neo-fascist or post-fascist are sometimes employed to describe contemporary parties with ideologies similar to, or rooted in, 20th-century fascist movements. 

The first fascist movements emerged in Italy during World War I, before spreading to other European countries, most notably Germany. Fascism also had adherents outside of Europe. Fascists saw World War I as a revolution that brought massive changes to the nature of war, society, the state, and technology. Fascism rejects assertions that violence is inherently bad and views imperialism, political violence and war as means to national rejuvenation. Fascists often advocate for the establishment of a totalitarian one-party state. Fascism's extreme authoritarianism and nationalism often manifests as belief in racial purity or a master race, usually blended with some variant of racism or bigotry against a demonized "Other" that is seen as an existential threat.