Final answer:
Nationalism can lead to conflict due to its association with pride, power, and exclusionary practices based on identity. Stark differences in national philosophies often exacerbate these tensions, leading to rifts between nations. The impact of nationalism is also evident in public policies, especially concerning immigration and citizenship practices.
Step-by-step explanation:
Feelings and ideas about nationality sometimes lead to conflict because they are tied to strong emotions of pride and devotion. Nationalism is a powerful force that can unify a nation, but it also intensifies competition and the desire for power and autonomy. Nationhood is a social construct that can evoke such a profound sense of identity that people are willing to fight and even die for it. Such identities are often tied to ethnic or cultural lineage which can result in exclusionary practices.
Moreover, different philosophies of nationalism, as seen between Germany and France historically, can create rifts between nations. German nationalism was based on ethnic lines, while French nationalism was loyalty-based, showing that conflicts can arise from differing national identities and values.
Additionally, public policies and citizenship practices are often influenced by these cultural beliefs. For instance, in the United States, the tension over immigration can be linked to concerns about cultural changes or economic impacts, resulting in restrictive laws and conflicting opinions on the matter.