<span>1. the policy of segregating people by race is Apartheid This was seen in South Africa and many other places where race was an important issue 2. is Balkanization, like the name of Balkans where the thing described occurred after the fall of communism. 3. is </span>colonization, seen in Africa, North and South America, mostly by European forces. 4. is demilitarized zone, usually overseen by the United Nations and used for civilians or providing aid to people.
Nationalism was one of the reasons people started to imperialize, and when ever a coubtry starts to imperialize it often show the political and the military power of a country.