Answer:
Nationalism is an ideology or worldview in which national identity is crucial for the formation and survival of a sovereign state. According to some nationalists, for members of one nation the relationship to the nation is more important than any other element of personal or collective identity and any other relationship of loyalty.
In the 20th century, nationalist leaders aimed to provide decent living conditions for broad sections of the people of their nations. Now, this situation, strengthened after the First World War, was taken over by right-wing totalitarian ideologies. Therefore, nationalism in various manifestations of fascism became an inseparable part of these ideologies, that build a vision of universal ideological unity of the people, one-party rule, militarism and statism.
Thus, Nazism made use of these tools (the fragility of the Weimar Republic, the hyperinflation in Germany, the growing poverty of its population and the discontent after the Treaty of Versailles) to promote an exacerbated nationalism that culminated in the development of ideas totalitarian within the German people itself.
