Nationalism is a political ideology that emphasizes the interests and culture of a particular nation, often prioritizing it over global or international considerations. It fosters a sense of pride and identity among people who share common characteristics, such as language, history, or ethnicity. Nationalists believe that their nation should be self-governing and independent, which can lead to movements for autonomy or independence. While nationalism can unite people and promote social cohesion, it can also lead to exclusionary practices or conflicts with other nations. In extreme cases, it may result in xenophobia or aggression towards those perceived as outsiders. Historical examples include the rise of nationalist movements in the 19th century and the impact of nationalism during World War I and World War II.