How did nationalism both unify and divide nations?

Nationalism can unify a nation by creating a sense of shared identity, pride, and loyalty among its citizens. It can foster a sense of unity and solidarity, allowing people to come together to work towards common goals. Nationalism can also motivate people to defend their country, culture, and values against external threats, promoting cohesion and unity.

However, nationalism can also divide nations by creating exclusivist and exclusionary tendencies. It can lead to the demonization and marginalization of minority groups, as well as fueling conflicts and tensions between different groups within a nation. Nationalism can also lead to the belief that one's own nation is superior to others, which can create distrust and hostility towards other nations.

Furthermore, nationalist movements can lead to the fragmentation and disintegration of multi-ethnic or multi-cultural nations, as different groups may seek to assert their own national identity and interests. This can result in separatist movements and conflicts that threaten the stability and unity of a nation.

In conclusion, while nationalism has the potential to unify nations by fostering a sense of commonality and shared identity, it can also divide nations by creating exclusionary tendencies and fueling conflicts between different groups.