Final answer:
Extreme nationalism is sometimes characterized by radical political ideologies such as fascism and Nazism, which promote the interests of the nation over international concerns and exhibit beliefs in superiority and exclusivism.
Step-by-step explanation:
Nationalism is sometimes characterized by extreme nationalism. It is a radical political ideology that promotes the interests of the nation over international concerns and advocates the uniqueness and inherent superiority of one's own country. This ideology can lead to hostility towards outsiders and marginalization of minority communities. Examples of extreme nationalism include the ideologies of fascism and Nazism.