While both Italian Fascism and German Nazism are forms of totalitarian, ultra-nationalist, and authoritarian ideologies, they possessed distinct characteristics and priorities. Understanding these differences is crucial for a comprehensive grasp of 20th-century political history.

Italian Fascism (Mussolini's Fascism):

1. Origin and Ideology: Italian Fascism, founded by Benito Mussolini, emerged in the aftermath of World War I, fueled by nationalistic fervor, a desire for a strong state, and a rejection of both liberal democracy and communism. Its core ideology was the absolute supremacy of the state, often encapsulated in the slogan "Everything within the State, nothing outside the State, nothing against the State."
2. Role of the State: The state was seen as the ultimate expression of the nation's will and destiny. It aimed for a corporatist economic system where labor and capital were organized into state-controlled corporations, theoretically to serve national interests and eliminate class conflict.
3. Racial Ideology: Initially, Italian Fascism was not overtly racial. While it promoted Italian national identity and cultural superiority, it did not have a systematic, biological racial theory like Nazism. Anti-Semitism was not a core tenet until Mussolini aligned more closely with Hitler in the late 1930s, leading to the introduction of racial laws.
4. Expansionism: Italian expansionism focused on restoring the glory of the Roman Empire, primarily in the Mediterranean and Africa (e.g., invasion of Ethiopia).
5. Pragmatism: Mussolini's regime often displayed a degree of pragmatism and was willing to make compromises, especially in its early years, to consolidate power.

German Nazism (Hitler's National Socialism):

1. Origin and Ideology: German Nazism, led by Adolf Hitler, also arose from post-WWI grievances, economic hardship, and a deep sense of national humiliation. Its ideology was rooted in a virulent form of racial anti-Semitism and the concept of an 'Aryan master race.' The term 'National Socialism' combined extreme nationalism with a superficial appeal to socialist rhetoric, though it was fundamentally anti-Marxist.
2. Role of the State and Race: For Nazism, the state was merely a tool to serve the interests of the 'Volk' (people/race). The racial purity and superiority of the Aryan race were paramount, and all state policies were geared towards this goal. The individual existed solely for the race.
3. Racial Ideology: Racial ideology, particularly anti-Semitism, was central and foundational to Nazism from its inception. Jews were scapegoated as the ultimate enemy, leading to systematic persecution and genocide (the Holocaust). Other groups deemed 'inferior' (Roma, Slavs, disabled people) were also targeted.
4. Expansionism: German expansionism was driven by the concept of 'Lebensraum' (living space) for the Aryan race, primarily in Eastern Europe, involving conquest, ethnic cleansing, and colonization.
5. Totalitarian Control: Nazism sought absolute, total control over all aspects of life – political, social, economic, cultural, and even personal – through a vast network of party organizations, propaganda, and terror (Gestapo, SS).

Summary of Key Differences:

• Centrality of Race: Nazism was fundamentally a racial ideology with anti-Semitism at its core; Italian Fascism was primarily state-centric and nationalistic, with racial elements becoming prominent later due to German influence.
• Purpose of the State: For Italian Fascism, the state was an end in itself; for Nazism, the state was a means to an end – the preservation and glorification of the 'Aryan race.'
• Economic System: Italian Fascism promoted corporatism; Nazism maintained private ownership but subjected the economy to strict state control for war aims.
• Pragmatism vs. Dogmatism: Italian Fascism showed more pragmatic flexibility; Nazism was rigidly dogmatic, especially regarding its racial theories.

In essence, while both were authoritarian and nationalistic, Nazism's unique and devastating contribution was its systematic, biologically-driven racial ideology, which led to unprecedented atrocities.