Answer:
Nationalism can lead to a strong sense that your own country is superior to other countries. This means a nationalistic group might be extreme and seek to conquer and assimilate other countries in order to spread their own culture and influence due to that sense of superiority. Imperialism is when a country invades other countries to spread its influence and agenda.
Explanation:
For less complication like these people post here you are "The United States saw the Ngo Dinh Diem was alienating South Vietnamese citizens."