Answer:
True.
Explanation:
Nationalism holds that each nation should govern itself, free from outside interference (self-determination), that a nation is a natural and ideal basis for a polity, and that the nation is the only rightful source of political power (popular sovereignty).
In practice, nationalism can be seen as positive or negative depending on context and individual outlook. Conversely, radical nationalism combined with racial hatred was also a key factor in the Holocaust perpetrated by Nazi Germany.