Why was nationalism an Import ant factor?

Nationalism was an important factor because it fostered a sense of unity and identity among people within a nation, often leading to movements for independence and self-determination. It played a crucial role in the formation of nation-states and the redrawing of borders, particularly in the 19th and 20th centuries. Nationalist sentiments also fueled conflicts and wars, as groups sought to assert their cultural and political rights, significantly shaping global history. Moreover, nationalism influenced the development of political ideologies and movements, impacting governance and international relations.