Extreme nationalism is a political ideology that emphasizes the interests and culture of a particular nation above all else. It often involves a strong belief in national superiority and can lead to the exclusion or hostility towards other nations or groups. This form of nationalism can manifest in various ways, including aggressive foreign policies and the promotion of national unity at the expense of diversity. Historically, extreme nationalism has been associated with movements and regimes that prioritize national identity, sometimes resulting in conflict and oppression. Examples include the rise of Nazi Germany and Fascist Italy, where extreme nationalist sentiments contributed to widespread discrimination and war.